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NEET2011PhysicsMagnetic Properties of MatterActual

A short bar magnet of magnetic moment 0.4 ~J ~T ⁻¹ is place in a uniform magnetic field of 0.16 ~T . The magnet is stable equilibrium when the potential energy is

Options

  1. A-0.64 ~J
  2. Bzero
  3. C-0.082 ~J
  4. D0.064 ~J

Correct answer

D. 0.064 ~J

Step-by-step solution

We know that U=-M B For stable equilibrium =0^ aligned U & =-M B & =-(0.4)(0.16)=-0.064 ~J aligned

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