In the question number 73, the given coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 5T in the horizontal direction exists such that initially the axis of the coil is in direction of the field. The coil rotates through an angle of `60^(@)` under the influence of magnetic field. The magnitude of torque on the coil in the final position isA. 25 N mB. `25 sqrt3 N m`C. 40 N mD. `40 sqrt3 N m`

In the question number 73, the given coil is placed in a vertical plan

1.	In the question number 73, the given coil is placed in a vertical plane and is free to rotate about a horizontal axis which coincides with its diameter. A uniform magnetic field of 5T in the horizontal direction exists such that initially the axis of the coil is in direction of the field. The coil rotates through an angle of `60^(@)` under the influence of magnetic field. The magnitude of torque on the coil in the final position isA. 25 N mB. `25 sqrt3 N m`C. 40 N mD. `40 sqrt3 N m`
Answer» Correct Answer - B Torque `\|vec(tau)\|=\|vecm xx vecB\|=m B sin theta` Here, m =`"10 A m"^(2), B = 5 T` Now initially `theta=0^(@)` Thus, initial torquie, `tau_(i)=0` In final position `theta=60^(@)` `therefore" "tau_(f)=m B sin 60^(@)=10xx5xx(sqrt3)/(2)=25sqrt3"N m"`

Discussion

No Comment Found

Related InterviewSolutions

When a current carrying coil is situated in a uniform magnetic field with its magnetic moment antiparallel to the field `i)` Torque on it is maximum `ii)` Torque on it is minimum `iii) PE` of loop is maximum `iv)PE` of loop is minimumA. only `i` and `ii` are trueB. only `ii` and `iii` are trueC. only `iii` and `iv ` are trueD. only `I,ii` and `iii` are true
If plane of coil and uniform magnetic field B(4T0 is same then torque on the current carrying coil is A. `l(piR^(2)) 4(1)`B. `(l(pi R^(2))4)/(2)`C. `(lpi R^(2)4)/(8)`D. Zero
A moving coil type of galvanometer is based upon the principle thatA. a coil carrying current experiences a torque in magnetic field.B. a coil carrying current produces a magnetic field.C. a coil carrying current experiences impulse in a magnetic field.D. a coil carrying current experience a force in magnetic field.
When a current carrying coil is placed in a uniform magnetic field of induction `B`, then a torque `tau` acts on it. If `I` is the current, `n` is the number of turns and `A` is the face area of the coil and the normal to the coil makes an angle `theta` with `B`, ThenA. `tau=BInA`B. `tau = B I nA sin theta`C. `tau=B InA cos theta`D. `tau=B I n A tan theta`
A proton is accelerating on a cyclotron having oscillating frequency of 11 MHz in external magnetic field of 1 T. If the radius of its dees is 55 cm, then its kinetic energy (in MeV) is is `(m_(p)=1.67xx10^(-27)kg, e=1.6xx10^(-19)C)``A. 13.36B. 12.52C. 14.89D. 14.49
A steady current `i` flows in a small square lopp of wire of side `L` in a horizontal plane. The loop is now folded about its middle such that half of it lies in a vertical plane. Let `vecmu_(1)` and `vecmu_(2)` respectively denote the magnetic moments due to the current loop before and after folding. ThenA. `vec(mu_(2))=0`B. `vec(mu_(1))` and `vec(mu_(2))` are in the same directionC. `|vec(mu_(1))|//|vec(mu_(2))|=sqrt(2)`D. `|vec(mu_(1))|//|vec(mu_(2))|=(1//sqrt(2))`
Two positive charges `q_1 and q_2` are moving with velocities `v_1 and v_2` when they are at points A and B, respectively, as shown in Fig. The magnetic force experienced by charge `q_1 ` due to the other charge `q_2` is A. `(mu_(0)q_(1)q_(2)upsilon_(1)upsilon_(2))/(8sqrt(2)pi a^(2))`B. `(mu_(0)q_(1)q_(2)upsilon_(1)upsilon_(2))/(4sqrt(2)pi a^(2))`C. `(mu_(0)q_(1)q_(2)upsilon_(1)upsilon_(2))/(2sqrt(2)pi a^(2))`D. `(mu_(0)q_(1)q_(2)upsilon_(1)upsilon_(2))/(sqrt(2)pi a^(2))`
A particle of mass `m` and charge `q` moves with a constant velocity `v` along the positive `x` direction. It enters a region containing a uniform magnetic field `B` directed along the negative `z` direction, extending from `x = a` to `x = b`. The minimum value of `v` required so that the particle can just enter the region `x gt b` isA. `qb" "B//m`B. `q(b-a)B//m`C. `qa" "B//m`D. `q(b+a)B//2m`
A proton moving with a velocity of `2xx10^(6)ms^(-1)` describes circle of radius `R` in a magnetic field. The speed of an `alpha-` particle to describe a circle of same radius in the same magnitude field isA. `1xx10^(6)m//s`B. `2xx10^(6)m//s`C. `4xx10^(6)m//s`D. `8xx10^(6)m//s`
An electron of energy 1800 eV describes a circular path in magnetic field of flux density 0.4 T. The radius of path is `(q = 1.6 xx 10^(-19) C, m_(e)=9.1 xx 10^(-31) kg)`A. `2.58xx10^(-4)m`B. `3.58xx10^(-4)m`C. `2.58xx10^(-3)m`D. `3.58xx10^(-4)m`

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment