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AIIMS2018PhysicsMagnetic Effects of Current

Two magnets are suspended by a given wire one by one. In order to deflect the first magnet through 45^ , the wire has to be twisted through 540^ whereas with the second magnet, the wire requires a twist of 360^ for the same deflection. Then the ratio of magnetic moments of the two magnets is

Options

  1. A11 / 7
  2. B3 / 2
  3. C4 / 3
  4. D7 / 6

Correct answer

A. 11 / 7

Step-by-step solution

If C is torque per unit angular twist of the wire, then for a twist , =C =M B . In the 1^ st case, ₁=540^ -45^ =495^ , ₁=45^ In the 2^ nd case, ₂=360^ -45^ =315^ , ₂=45^ Dividing (i) by (ii), we get M₁ M₂ = 495 315 = 11 7

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