A bar magnet of length l and magnetic dipole
Asked by admin @ in Physics viewed by 343 People
A bar magnet of length l and magnetic dipolemoment M is bent in the form of an arc as shown in figure. The new magnetic dipole
moment will be :-
Answered by admin @
new dipole moment is 3M/π
we know, magnetic dipole moment = magnetic moment × minimum seperation between two poles.
let magnetic moment is m.
so, initial magnetic moment, M =ml.....(1)
A bar of length l is bent into arc, angle made by arc in centre is 60°.
so, length of bar = arc length
⇒l = π/3 × r
⇒r = 3l/π .......(2)
now, new magnetic dipole moment = m × r
= m × 3l/π [ from equation (2) ]
= 3ml/π
= 3M/π [ from equation (1)..]
hence, new dipole moment is 3M/π
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