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AP EAMCET201725 Apr 2017Morning ShiftPhysicsMagnetic Effects of CurrentActual

A circular coil of radius 9 ~cm carrying a current of 2 ~A is free to rotate about an axis in its plane perpendicular to an external magnetic field of 10⁻² ~T . When the coil is turned slightly and released, it oscillates about its stable equilibrium with a time period of 1 3 ~s . If the moment of inertia of the coil about its axis of rotation is 9 10⁻⁵ kgm ^2 , the number of turns of the coil is ____

Options

  1. A10
  2. B20
  3. C30
  4. D40

Correct answer

B. 20

Step-by-step solution

No solution. Refer to answer key.

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