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JEE Main2018PhysicsMagnetic Effects of CurrentActual

A charge q is spread uniformly over an insulated loop of radius r . If it is rotated with an angular velocity ω with respect to normal axis then magnetic moment of the loop is:

Options

  1. A3 2 q ω r 2
  2. B1 2 q ω r 2
  3. Cq ω r 2
  4. D4 3 q ω r 2

Correct answer

B. 1 2 q ω r 2

Step-by-step solution

M L = q 2 m ⇒ M = q 2 m × m r 2 ω ⇒ M = q ω r 2 2 .

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