A bar magnet having a magnetic moment of 2.0 $\times$ 105 JT$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :

Question

A bar magnet having a magnetic moment of 2.0 $\times$ 10⁵ JT^$-$1, is placed along the direction of uniform magnetic field of magnitude B = 14 $\times$ 10^$-$5 T. The work done in rotating the magnet slowly through 60$^\circ$ from the direction of field is :

14 J

8.4 J

4 J

1.4 J

Solution

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