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JEE Main2017PhysicsMagnetic Effects of CurrentActual

A magnetic dipole in a uniform magnetic field has: (Take zero potential energy when magnetic dipole is perpendicular to magnetic field)

Options

  1. AMaximum potential energy when the torque is maximum
  2. BZero potential energy when the torque is maximum
  3. CZero potential energy when the torque is minimum
  4. DMinimum potential energy when the torque is maximum

Correct answer

B. Zero potential energy when the torque is maximum

Step-by-step solution

Torque, τ = M B sin θ and potential energy, U = - M B cos θ τ is maximum when θ = 90 o U = - M B cos 90 o = 0 .

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