Question:

The magnetic moment of a bar magnet is 0.5 Am^2. It is suspended in a uniform magnetic field of 8 × 10-2 T. The work done in rotating it from its most stable to most unstable position is :

(1) 16 × 10-2 J

(2) 8 × 10-2 J 

(3) 4 × 10-2 J 

(4) Zero 

                                       JEE -2024

Solution:                
The magnetic moment of a bar magnet is 0.5 Am^2. It is suspended in a uniform magnetic field of 8 × 10-2 T. The work done in rotating it from its most stable to most unstable position is : (1) 16 × 10-2 J (2) 8 × 10-2 J (3) 4 × 10-2 J (4) Zero

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