816 + Interview Questions in MAGNETISM IN GENERAL AWARENESS Page 12 InterviewSolution

551.	A cylindrical rod magnet has a length of 5 cm and a diameter of 1 cm. It has a unifirm magnetisation of `5.30xx10^(3) Amp//m^(3)`. What its magnetic dipole moment?A. `20.8mJT^(-1)`B. `10.8mJT^(-1)`C. `5.8mJT^(1)`D. `30.8mJT^(-1)`
Answer» Correct Answer - A `M(m)/(V)` or `m=MV` `m=Mxx(pi r^(2)l)` `=(5.3xx10^(3))(3.14)(5xx10^(-3))^(2)(5xx10^(-2))J//T =20.8xx10^(-3)J//T=20.8mJ//T`

Discussion

552.	A magnet of magnetic moment M amd pole strenth m is divided in two equal parts, then magnetic moment of each part will beA. MB. `M//2`C. `M//4`D. 2M
Answer» Correct Answer - B

Discussion

553.	If a magnet of pole strenth m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will beA. `m//4`B. `m//2`C. `m//8`D. `4m`
Answer» Correct Answer - B

Discussion

554.	Convert 1 tesla into gauss.
Answer» 1 tesla = 10, 000 gauss.

Discussion

555.	The angle between the magnetic meridian and geographical meridian is calledA. angle of dipB. angle of declinationC. magnetic momentD. power of magnetic field
Answer» Correct Answer - B The angle between the magnetic meridian and the geographical meridian is called magnetic declination .

Discussion

556.	When a magnet is cut into two pieces along its length,then each piece of magnet will haveA. Same pole strengthB. Reduced pole strengthC. Increased pole strengthD. Can not be predicted
Answer» Correct Answer - B

Discussion

557.	State if the following statements are true or false.1. If a bar magnet is cut in two pieces, then one piece will have only the north pole and the other will have only the south pole.2. Attraction is the surest test for magnetism.3. Temporary magnets are made of cobalt.4. As we move away from a magnet, its attraction power weakens.5. Whenever a magnet is not in use, it should be stored along with other magnets.
Answer» 1. False. If a bar magnet is cut in two pieces, then each of the piece will have the north pole and the south pole. 2. False. Repulsion is the surest test for magnetism. 3. False. Temporary magnets are made of soft iron. 4. True. 5. False. Whenever a magnet is not in use, it should not be stored along with other magnets.

557.

State if the following statements are true or false.1. If a bar magnet is cut in two pieces, then one piece will have only the north pole and the other will have only the south pole.2. Attraction is the surest test for magnetism.3. Temporary magnets are made of cobalt.4. As we move away from a magnet, its attraction power weakens.5. Whenever a magnet is not in use, it should be stored along with other magnets.

Answer»

1. False.

If a bar magnet is cut in two pieces, then each of the piece will have the north pole and the south pole.

2. False.

Repulsion is the surest test for magnetism.

3. False.

Temporary magnets are made of soft iron.

4. True.

5. False.

Whenever a magnet is not in use, it should not be stored along with other magnets.

Discussion

558.	Which of the following is not a magnetic substance?A. cobaltB. ironC. CopperD. Nickel
Answer» Correct Answer - C

Discussion

559.	A magnet is cut into two pieces perpendicular to its legth,then each piece will be a magnet ofA. Same pole strengthB. Different pole strengthC. May increase or decrease inpole stregthD. Can not be predicted
Answer» Correct Answer - A

Discussion

560.	The direction of magnetic field at any point inside the field is given by _________.A. perpendicular to the line of forceB. tangent to the line of forceC. the line of force itselfD. none of the above
Answer» Correct Answer - B

Discussion

561.	Magnetic dipole moment is a vector directed fromA. S pole to N poleB. N pole to S poleC. Perpendicular to dipoleD. None of these
Answer» Correct Answer - A

Discussion

562.	Choose the correct match `{:("(A). Ferromagnetic ",,"(a) Water"),("(B). Diamagnetic",,"(b) Cobalt"),("(C). Paramagnetic",,"(c) Chromium"):}`A. A-b,B-c,C-aB. A-c,B-a,C-bC. A-b,B-a,C-cD. A-a,B-c,C-b
Answer» Correct Answer - C

Discussion

563.	Cobalt is a __________substanceA. ferromagneticB. paramagneticC. diamagneticD. all of these
Answer» Correct Answer - A Cobalt is a ferromagnetic substance.

Discussion

564.	The angle of dip increases as we move fromA. poles to equatorB. equator to polesC. dip is equal at all placesD. all of these
Answer» Correct Answer - B The angle of dip increases as we move from the equator to the poles.

Discussion

565.	Define the following terms regarding a bar magnet,1. Magnetic axis2. Effective length3. Magnetic equator4. Magnetic field
Answer» 1. An imaginary line (XY) passing through the magnetic north pole and magnetic south pole of a bar magnet is called its magnetic axis. 2. The distance (NS) between the north pole and south pole of a magnet is called the length or effective length of the magnet. 3. An imaginary line (PQ) bisecting the effective length of a magnet is called the magnetic equator of the magnet. 4. The region around a magnet where its magnetic force can be experienced is called the magnetic field.

565.

Define the following terms regarding a bar magnet,1. Magnetic axis2. Effective length3. Magnetic equator4. Magnetic field

Answer»

1. An imaginary line (XY) passing through the magnetic north pole and magnetic south pole of a bar magnet is called its magnetic axis.

2. The distance (NS) between the north pole and south pole of a magnet is called the length or effective length of the magnet.

3. An imaginary line (PQ) bisecting the effective length of a magnet is called the magnetic equator of the magnet.

4. The region around a magnet where its magnetic force can be experienced is called the magnetic field.

Discussion

566.	The vertical plane in which magnetic needle lies at a place is called______A. geographical meridianB. magnetic equatorC. geographical equatorD. magnetic meridian
Answer» Correct Answer - D

Discussion

567.	The horizontal and vertical component of magnetic field of Earth are same at some place on the surface of Earth. The magnetic dip angle at this place will be (A) 30° (B) 45° (C) 0° (D) 90°
Answer» Correct answer is (B) 45°

Discussion

568.	The effective length of the magnet shown above is ______.A. yB. 2yC. xD. x/2
Answer» Correct Answer - B

Discussion

569.	What is a geographic meridian? How does the declination vary with latitude? Where is it minimum?
Answer» A plane perpendicular to the surface of the Earth (vertical plane) and passing through geographic axis is geographic meridian. i. Angle between the geographic and the magnetic meridian at a place is called magnetic declination (a). ii. Magnetic declination varies with location and over time. As one moves away from the true north the declination changes depending on the latitude as well as longitude of the place. By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. The declination is small in India. It is 0° 58′ west at Mumbai and 0° 41′ east at Delhi.

569.

What is a geographic meridian? How does the declination vary with latitude? Where is it minimum?

Answer»

A plane perpendicular to the surface of the Earth (vertical plane) and passing through geographic axis is geographic meridian.

i. Angle between the geographic and the magnetic meridian at a place is called magnetic declination (a).

ii. Magnetic declination varies with location and over time. As one moves away from the true north the declination changes depending on the latitude as well as longitude of the place. By convention, declination is positive when magnetic north is east of true north, and negative when it is to the west. The declination is small in India. It is 0° 58′ west at Mumbai and 0° 41′ east at Delhi.

Discussion

570.	Magnetic meridian is the plane (A) perpendicular to the magnetic axis of Earth (B) perpendicular to geographic axis of Earth (C) passing through the magnetic axis of Earth (D) passing through the geographic axis
Answer» Correct answer is (C) passing through the magnetic axis of Earth

Discussion

571.	The equatorial meridian of a magnet______A. bisects the magnetic axis perpendicularlyB. is parallel to the magnetic axisC. makes certain angle with the magnetic equatorD. contains both the poles of the magnet
Answer» Correct Answer - A

Discussion

572.	The magnetic field to a small magnetic dipole of magnetic moment `M`, at distance r from the centre on the equatorial line is given by (in M.K.S. system)A. `(mu_(0))/(4pi)xx(M)/(r^(2))`B. `(mu_(0))/(4pi)xx(M)/(r^(3))`C. `(mu_(0))/(4pi)xx(2M)/(r^(2))`D. `(mu_(0))/(4pi)xx(2M)/(r^(3))`
Answer» Correct Answer - B

Discussion

573.	1 Tesla =A. 1 Wb/mB. 1J/AmC. 1N/AmD. 1Am/N
Answer» Correct Answer - C

Discussion

574.	Which of the following is the most suitable material for making permanent magnet ?A. BrassB. nickelC. AluminiumD. copper
Answer» Correct Answer - B

Discussion

575.	Which of the following, the most suitable material for making permanent magnet isA. SteelB. Soft ironC. CopperD. nickel
Answer» Correct Answer - A

Discussion

576.	The magnetic field due to a short magnet at a point in its axis at distance `X` cm from the middle of the magnet isA. 100 GaussB. 400 GaussC. 50 GaussD. 200 Gauss
Answer» Correct Answer - A

Discussion

577.	The magnetic induction at distance of `0.1m` from a strong magnetic pole of strength `1200 Am` isA. `12xx10^(-3)T`B. `12xx10^(-4)T`C. `1.2xx10^(-3)T`D. `24xx10^(-3)T`
Answer» Correct Answer - C `B=(mu_(0))/(4pi)(m)/(d^(2))`

Discussion

578.	The magnet potential at a point on the line inclined at `60^(@)` with the axis of short magnet is `1.5 xx 10^(-5) J//Am`.If the magnetic moment of magnet is `3Am^(2)`,then the distance of the point from the centre of the dipole will bwA. 0.1mB. 0.1 cmC. 0.01 mD. 0.5 m
Answer» Correct Answer - A `r^(2)=(mu_(0))/(4pi)M[(1)/(r_(1)^(2))-(1)/(r_(2)^(2))]=10^(-7)xx3[(1)/(0.25)-(1)/(1)]` `=9xx10^(-7)J//Am`

Discussion

579.	The magnetic induction and magnetic potential due to a magnetic dipole of moment 15`Am^(2)` at a distance of 1m from its centre along a line making an angle of`60^(@)` with its axis areA. `19.8 xx10^(-7) T,7.5 xx10^(-7) J//Am`B. `8.19 xx10^(-7) T,7.5xx10^(-7) J//Am`C. `19.8 xx10^(-7) T,5.7 xx10^(-7) J//Am`D. `8.19 xx10^(-7)T,5.7 xx10^(-7) J//Am`
Answer» Correct Answer - A `B=(mu_(0))/(4pi)sqrt(3cos^(2)theta+1)` `=(10^(-7)xx15)/(1)sqrt(3cos^(2)theta+1)=19.8xx10^(-7)T` `V=(mu_(0))/(4pi)(Mcostheta)/(r^(2))` `=(10^(-7)xx15xxcos60)/(1)=7.5xx10^(-7)J/Am`

Discussion

580.	The ratio of the magnetic ppotentials due to a magnetic dipole at two equidistant points,one of them along a line making an angle of `30^(@)` and the other along a line making an angle of `70^(@)` with the magnetic dipole moment vector isA. 3.5B. 1.5C. 2.5D. 4.5
Answer» Correct Answer - C `(V_(1))/(V_(2))=(costheta_(1))/(costheta_(2))=(cos30)/(cos70)=2.531`

Discussion

581.	The pole stregth potential at a point due to a short magnetic dipole of moment 5 `Am^(2)` at a distance of 2m from its centre on a line making an angle of`30^(@)` with it isA. 40AMB. 50 AmC. 60 AmD. 70 Am
Answer» Correct Answer - B `2l=(5)/(6)xx"geometric length"=(5)/(6)xx12=10cm` `m=(M)/(2l)=(5)/(0.1)=50 Am`

Discussion

582.	The magnetic potential at a point at a distance of 10 cm from mid point of magnetic dipole on a line making an angle of `60^(@)` with axis is `1.5 xx 10^(-7) Wb//m`.The magnetic moment of the dipole isA. `0.01 Am^(2)`B. `0.02Am^(2)`C. `0.03 Am^(2)`D. `0.04 Am^(2)`
Answer» Correct Answer - C `V=(mu_(0))/(4pi)(Mcostheta)/(r^(2)` `therefore M=(v4pir^(2))/(mu_(0)costheta)=(1.5xx10^(-7)xx10^(-2))/(10^(-7)xxcos60)=0.03Am^(2)`

Discussion

583.	A bar magnet has a magnetic moment `2.5JT^(-1)` and is placed in a magnetic field of `0.2 T`. Calculate the work done in turning the magnet from parallel to antiparallel position relative to field direction.
Answer» Work done in changing the orientation of a dipole of moment `M` in a field `B` from position `theta_(1)` to `theta_(2)` is given by `W=MB(costheta_(1)-costheta_(2))` Here, `theta_(1)=0^(@)` and `theta_(2)=180^(@)` So, `W=2MB=2xx2.5xx0.2=1J`

Discussion

584.	The magnetic induction at a point on equator of a short magnetic dipole isA. `(pi_(0))/(4pi)(2M)/(r^(3))`B. `(pi_(0))/(4pi) (M)/(r^(3))`C. `(pi_(0))/(4pi)(2M)/(r^(2))`D. `(pi_(0))/(4pi) (M)/(r^(2))`
Answer» Correct Answer - B

Discussion

585.	The direction of resultant magnetic induction at any point due to a short magnetic dipole is inclined to the axis dipole at an angleA. `tan^(-1)((1)/(2)tantheta)`B. `(1)/(2)tantheta`C. `tan^(-1)(tan(theta)/(2))`D. `tan^(-1)(2tan theta)`
Answer» Correct Answer - A

Discussion

586.	The magnetic induction at any point due to short magnetic dipole is inversely proportional to itsA. DistanceB. Square of distanceC. Cube of distanceD. None of these
Answer» Correct Answer - C

Discussion

587.	The ratio of magnitude of magnetic induction (B)at any point due to short magnetic dipole and the magnetic potential (V) at that point is given byA. `(B)/(V)=(sqrt(3cos^(2)theta+1))/(rcostheta)`B. `(B)/(V)=(r costheta)/(sqrt(3cos^(2)theta+1))`C. `(B)/(V)=(sqrt(2cos^(2)theta+1))/(rcostheta)`D. `(B)/(V)=(sqrt(cos^(2)theta+1))/(rcostheta)`
Answer» Correct Answer - A

Discussion

588.	Magnetic induction at a point due to short magnetic dipole is`B_(1)`.The dipole is then cut into two equal parts.Magnetic induction at the same point due to either part isA. `(B_(1))/(4)`B. `(B_(1))/(2)`C. `B_(1)`D. `2B_(1)`
Answer» Correct Answer - B If the bar magnet is cut into two equal parts then each part has as magnetic moment equa, to M/2 therefore,magnetic induction at that point is also `B_(1)//2`.

Discussion

589.	The magnetic field strength at a distance 2m from a magnetic pole is`2xx10^(-7)`T.The pole strength of pole isA. 8AMB. 4AmC. 16AmD. 80Am
Answer» Correct Answer - A `r=2m,B=2xx10^(-7)T,m=?` `B=(mu_(0))/(4pi)(m)/(r^(2))` `2xx10^(-7)=(10^(-7)xxm)/(4)` m=8Am

Discussion

590.	A magnet of magnetic moment `2JT^(-1)` is aligned in the direction of magnetic field of `0.1T`. What is the net work done to bring the magnet normal to the magnrtic field?A. 0.1 JB. 0.2 JC. 1 JD. 2 J
Answer» Correct Answer - B

Discussion

591.	A magnet of magnetic moment M is rotated through `360^(@)` in a magnetic field H, the work done will beA. MHB. 2MHC. `2piMH`D. zero
Answer» Correct Answer - D

Discussion

592.	The small magnets each of magnetic moment `10 A-m^(2)` are placed end-on position 0.1 m apart from their centres. The force acting between them isA. `0.6xx10^(-7) N`B. `0.06xx10^(7) N`C. `0.6 N`D. `0.06 N`
Answer» Correct Answer - C

Discussion

593.	Magnetic lines of forceA. Always intersectB. Are always closedC. Tend to crowd far away from the poles of magnetD. Do not pass through vacuum
Answer» Correct Answer - B

Discussion

594.	Magnetic susceptibility of free space is:(a) +1(b) -1(c) zero(d) infinity
Answer» (c) zero Magnetic susceptibility of free space is zero.

Discussion

595.	Magnetic susceptibility for superconductors is :(a) +1(b) -1(c) zero(d) infinity
Answer» (b) -1 For superconductors, value of magnetic susceptibility is -1.

Discussion

596.	Name the magnetic substance whose nature does not change by changing the normal temperature.
Answer» The magnetic behaviour of diamagnetic substance does not change by changing the normal temperature.

Discussion

597.	Write unit of magnetic pole strength.
Answer» The unit of magnetic pole strength is (A-m).

Discussion

598.	A magnetic needle which is free to rotate in a vertical plane if placed at geomagnetic south or north pole, then in which direction it rotates?
Answer» Free magnetic needle in vertical plane always indicate in vertical up or down.

Discussion

599.	The hysteresis cylcle for the material of a permanent magnet isA. Short and wideB. tall and narrowC. tall and wideD. short and narrow
Answer» Correct Answer - C

Discussion

600.	A marners compass is usedA. to compare magnetic momentsB. for determination of `H`C. for determination of directionD. for determination of dip at a place
Answer» Correct Answer - C

Discussion

Explore topic-wise InterviewSolutions in .

A cylindrical rod magnet has a length of 5 cm and a diameter of 1 cm. It has a unifirm magnetisation of `5.30xx10^(3) Amp//m^(3)`. What its magnetic dipole moment?A. `20.8mJT^(-1)`B. `10.8mJT^(-1)`C. `5.8mJT^(1)`D. `30.8mJT^(-1)`

A magnet of magnetic moment M amd pole strenth m is divided in two equal parts, then magnetic moment of each part will beA. MB. `M//2`C. `M//4`D. 2M

If a magnet of pole strenth m is divided into four parts such that the length and width of each part is half that of initial one, then the pole strength of each part will beA. `m//4`B. `m//2`C. `m//8`D. `4m`

Convert 1 tesla into gauss.

The angle between the magnetic meridian and geographical meridian is calledA. angle of dipB. angle of declinationC. magnetic momentD. power of magnetic field

When a magnet is cut into two pieces along its length,then each piece of magnet will haveA. Same pole strengthB. Reduced pole strengthC. Increased pole strengthD. Can not be predicted

Which of the following is not a magnetic substance?A. cobaltB. ironC. CopperD. Nickel

A magnet is cut into two pieces perpendicular to its legth,then each piece will be a magnet ofA. Same pole strengthB. Different pole strengthC. May increase or decrease inpole stregthD. Can not be predicted

The direction of magnetic field at any point inside the field is given by _________.A. perpendicular to the line of forceB. tangent to the line of forceC. the line of force itselfD. none of the above

Magnetic dipole moment is a vector directed fromA. S pole to N poleB. N pole to S poleC. Perpendicular to dipoleD. None of these

Choose the correct match `{:("(A). Ferromagnetic ",,"(a) Water"),("(B). Diamagnetic",,"(b) Cobalt"),("(C). Paramagnetic",,"(c) Chromium"):}`A. A-b,B-c,C-aB. A-c,B-a,C-bC. A-b,B-a,C-cD. A-a,B-c,C-b

Cobalt is a __________substanceA. ferromagneticB. paramagneticC. diamagneticD. all of these

The angle of dip increases as we move fromA. poles to equatorB. equator to polesC. dip is equal at all placesD. all of these

Define the following terms regarding a bar magnet,1. Magnetic axis2. Effective length3. Magnetic equator4. Magnetic field

The vertical plane in which magnetic needle lies at a place is called______A. geographical meridianB. magnetic equatorC. geographical equatorD. magnetic meridian

The horizontal and vertical component of magnetic field of Earth are same at some place on the surface of Earth. The magnetic dip angle at this place will be (A) 30° (B) 45° (C) 0° (D) 90°

The effective length of the magnet shown above is ______.A. yB. 2yC. xD. x/2

What is a geographic meridian? How does the declination vary with latitude? Where is it minimum?

Magnetic meridian is the plane (A) perpendicular to the magnetic axis of Earth (B) perpendicular to geographic axis of Earth (C) passing through the magnetic axis of Earth (D) passing through the geographic axis

The equatorial meridian of a magnet______A. bisects the magnetic axis perpendicularlyB. is parallel to the magnetic axisC. makes certain angle with the magnetic equatorD. contains both the poles of the magnet

The magnetic field to a small magnetic dipole of magnetic moment `M`, at distance r from the centre on the equatorial line is given by (in M.K.S. system)A. `(mu_(0))/(4pi)xx(M)/(r^(2))`B. `(mu_(0))/(4pi)xx(M)/(r^(3))`C. `(mu_(0))/(4pi)xx(2M)/(r^(2))`D. `(mu_(0))/(4pi)xx(2M)/(r^(3))`

1 Tesla =A. 1 Wb/mB. 1J/AmC. 1N/AmD. 1Am/N

Which of the following is the most suitable material for making permanent magnet ?A. BrassB. nickelC. AluminiumD. copper

Which of the following, the most suitable material for making permanent magnet isA. SteelB. Soft ironC. CopperD. nickel

The magnetic field due to a short magnet at a point in its axis at distance `X` cm from the middle of the magnet isA. 100 GaussB. 400 GaussC. 50 GaussD. 200 Gauss

The magnetic induction at distance of `0.1m` from a strong magnetic pole of strength `1200 Am` isA. `12xx10^(-3)T`B. `12xx10^(-4)T`C. `1.2xx10^(-3)T`D. `24xx10^(-3)T`

The magnet potential at a point on the line inclined at `60^(@)` with the axis of short magnet is `1.5 xx 10^(-5) J//Am`.If the magnetic moment of magnet is `3Am^(2)`,then the distance of the point from the centre of the dipole will bwA. 0.1mB. 0.1 cmC. 0.01 mD. 0.5 m

The ratio of the magnetic ppotentials due to a magnetic dipole at two equidistant points,one of them along a line making an angle of `30^(@)` and the other along a line making an angle of `70^(@)` with the magnetic dipole moment vector isA. 3.5B. 1.5C. 2.5D. 4.5

The pole stregth potential at a point due to a short magnetic dipole of moment 5 `Am^(2)` at a distance of 2m from its centre on a line making an angle of`30^(@)` with it isA. 40AMB. 50 AmC. 60 AmD. 70 Am

The magnetic potential at a point at a distance of 10 cm from mid point of magnetic dipole on a line making an angle of `60^(@)` with axis is `1.5 xx 10^(-7) Wb//m`.The magnetic moment of the dipole isA. `0.01 Am^(2)`B. `0.02Am^(2)`C. `0.03 Am^(2)`D. `0.04 Am^(2)`

A bar magnet has a magnetic moment `2.5JT^(-1)` and is placed in a magnetic field of `0.2 T`. Calculate the work done in turning the magnet from parallel to antiparallel position relative to field direction.

The magnetic induction at a point on equator of a short magnetic dipole isA. `(pi_(0))/(4pi)(2M)/(r^(3))`B. `(pi_(0))/(4pi) (M)/(r^(3))`C. `(pi_(0))/(4pi)(2M)/(r^(2))`D. `(pi_(0))/(4pi) (M)/(r^(2))`

The direction of resultant magnetic induction at any point due to a short magnetic dipole is inclined to the axis dipole at an angleA. `tan^(-1)((1)/(2)tantheta)`B. `(1)/(2)tantheta`C. `tan^(-1)(tan(theta)/(2))`D. `tan^(-1)(2tan theta)`

The magnetic induction at any point due to short magnetic dipole is inversely proportional to itsA. DistanceB. Square of distanceC. Cube of distanceD. None of these

Magnetic induction at a point due to short magnetic dipole is`B_(1)`.The dipole is then cut into two equal parts.Magnetic induction at the same point due to either part isA. `(B_(1))/(4)`B. `(B_(1))/(2)`C. `B_(1)`D. `2B_(1)`

The magnetic field strength at a distance 2m from a magnetic pole is`2xx10^(-7)`T.The pole strength of pole isA. 8AMB. 4AmC. 16AmD. 80Am

A magnet of magnetic moment `2JT^(-1)` is aligned in the direction of magnetic field of `0.1T`. What is the net work done to bring the magnet normal to the magnrtic field?A. 0.1 JB. 0.2 JC. 1 JD. 2 J

A magnet of magnetic moment M is rotated through `360^(@)` in a magnetic field H, the work done will beA. MHB. 2MHC. `2piMH`D. zero

The small magnets each of magnetic moment `10 A-m^(2)` are placed end-on position 0.1 m apart from their centres. The force acting between them isA. `0.6xx10^(-7) N`B. `0.06xx10^(7) N`C. `0.6 N`D. `0.06 N`

Magnetic lines of forceA. Always intersectB. Are always closedC. Tend to crowd far away from the poles of magnetD. Do not pass through vacuum

Magnetic susceptibility of free space is:(a) +1(b) -1(c) zero(d) infinity

Magnetic susceptibility for superconductors is :(a) +1(b) -1(c) zero(d) infinity

Name the magnetic substance whose nature does not change by changing the normal temperature.

Write unit of magnetic pole strength.

A magnetic needle which is free to rotate in a vertical plane if placed at geomagnetic south or north pole, then in which direction it rotates?

The hysteresis cylcle for the material of a permanent magnet isA. Short and wideB. tall and narrowC. tall and wideD. short and narrow

A marners compass is usedA. to compare magnetic momentsB. for determination of `H`C. for determination of directionD. for determination of dip at a place