First slide
Magnetism
Question

A magnetic dipole is free to rotate in a uniform magnetic field. For what orientation of the  magnet with respect to the magnetic field.

a) Torque is maximum             b) Potential energy is maximum

Easy
Solution

We know torque  τ=MBsinθ
    If  θ=900

   τmax=MB      

   Also,  P.E=- MBcosθ

  If  θ=1800

P.E =  +MB

Hence key (3) is correct

 

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