First slide
Magnetic dipole in a uniform magnetic field
Question

A magnet of magnetic moment M is lying in a magnetic field of inclination B. W1 is the work done in turning it from 0o to 60o and W2 is the work done in turning it from 30o to 90o. Then

Easy
Solution

W=MBcosθ1cosθ2W1=MBcos0cos60=mB/2W2=MBcos30cos90=3mB/2W2=3W1

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