Q62 / 90 · JEE Main 2017 (08 Apr Online) · Physics

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

  • A
    Maximum potential energy when the torque is maximum
  • Correct answer
    B
    Zero potential energy when the torque is maximum
  • C
    Zero potential energy when the torque is minimum
  • D
    Minimum potential energy when the torque is maximum

Solution

Torque, τ=MBsinθ

and potential energy, U=-MBcosθ

τ is maximum when θ=90o

U=-MBcos90o=0.

Hence, the correct answer is option: 'B'.

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