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A magnetic dipole experiences a torque of 80 3 ~N ~m when placed in uniform magnetic field in such a way that dipole moment makes angle of 60^ with magnetic field. The potential energy of the dipole is :

Options

  1. A80 ~J
  2. B-40 3 ~J
  3. C-60 ~J
  4. D-80 ~J

Correct answer

D. -80 ~J

Step-by-step solution

= M B = MB 60= 3 2 MB =80 3 aligned & MB =160 & U =- M B =- MB 60 & U =-160 1 / 2=-80 ~J aligned

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