A bar magnet of magnetic moment 104J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4 x10-5 T to a direction 600 from the field will be

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

0.2 J

2.0 J

4.18 J

2 x 102 J

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Magnetic moment of bar, M=104 J/THence, work done, W=MB(cos 0 - cos 60) = MB2 =104 x 4 x l0-5 x cos60o = 0.2 J

Watch 3-min video & get full concept clarity