Explain the pole strength and magnetic dipole moment of a bar magnet.

1.	Explain the pole strength and magnetic dipole moment of a bar magnet.
Answer» i. The bar magnet said to have pole strength +q_m and -q_m near the north and south poles respectively. ii. As bar magnet has two poles with equal and opposite pole strength, it is called as a magnetic dipole. iii. The two poles are separated by a distance equal to 2l. iv. The product of pole strength and the magnetic length is called as magnetic dipole moment. ∴ \(\overset\rightarrow{m}\) = q_m \((2\overset\rightarrow{l})\) where, \(2\overset\rightarrow{l}\) is a vector from south pole to north pole.

Answer»

i. The bar magnet said to have pole strength +q_m and -q_m near the north and south poles respectively.

ii. As bar magnet has two poles with equal and opposite pole strength, it is called as a magnetic dipole.

iii. The two poles are separated by a distance equal to 2l.

iv. The product of pole strength and the magnetic length is called as magnetic dipole moment.

∴ \(\overset\rightarrow{m}\) = q_m \((2\overset\rightarrow{l})\)

where, \(2\overset\rightarrow{l}\) is a vector from south pole to north pole.

Discussion

No Comment Found

Related InterviewSolutions

The variation of magnetic susceptibility `(chi)` with absolute temperature `T` for a ferromagnetic material isA. B. C. D.
A magnetic needle is kept in a non uniform magnetic field . It experiencesA. A force and torqueB. A torque but not a forceC. A force but not a torqueD. neither a torque nor a force
A short bar magnet of magnetic moment `12.8xx10^(-3)Am^(2)` is arranged in the magnetic meridian with its south pole pointing geographic north. If `B_(H)=0.4` gauss, the distance between the null points isA. `4cm`B. `8cm`C. `12cm`D. `16cm`
Distinguish between dia, para and ferro magnetism with examples.
Ferro magnetic materials used in transformer must haveA. low permeability and high hysterisis lossB. high permeability and low hysterisis lossC. high permeability and high hysterisis lossD. low permeability and low hysterisis loss
Assertion: The ferromagnetic substance do not obey Curie’s Law. Reason: At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.(a) If both assertion and reason are true and the reason in the correct explanation of the assertion. (b) If both assertion and reason are true but the reason is not correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.(e) If assertion is false but reason is true.
The magnetic susceptibility of any paramagnetic material changes with absolute temperature `T` asA. Directly proportional to TB. Remains constantC. Inversely proportional to TD. Exponentially decaying with T
State four important properties of a bar magnet.
State three important uses of a magnet.
A magnet of magnetic moment `20_(hatk) Am^(2)` is placed along the `z-`axis in a magnetic field `vec(B)=(0.4hat(j)+0.5hat(k)) T`. The torque acting on the magnet isA. `8hat(i)N-m`B. `6hat(i)N-m`C. `-8hat(i) N-m`D. `-6hat(i)N-m`