A bar magnet having a magnetic moment of 
is free to rotate in a horizontal plane. A horizontal magnetic field 
exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 
from the field is
Text Solution
Verified by ExpertsThe correct answer is:
C
When magnetic dipole is rotated from initial position θ 1 to final position θ 2 , then work done
Given, 
and 
Magnetic moment, 
and magnetic field, 
Work done to rotate bar magnet is 6 J.
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