Question

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. the energy required to rotate it by is , Now the torque required to keep the magnet in this new position is.

A

B

C

D

Medium
NEET
Updated on : 2022-09-05
Solution
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Correct option is C)

Torque acting on a bar magnet kept in a magnetic field is

Hence work done in moving from to is

Hence torque acting when magnet is placed at

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