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Assertion: a current loop experiences no net force in a uniform field. Reason: the forces on opposite sides of the loop are equal and opposite.

  • A.both the assertion and the reason are true but the reason does not explain the assertion
  • B.the assertion is true but the reason given for it is false
  • C.the assertion is false although the reason offered is a true statement in itself
  • D.both the assertion and the reason are true and the reason explains the assertion

Answer: D

In a uniform field the currents on opposite sides run in opposite directions through the same field, so the forces cancel as a resultant while forming a couple. In a non-uniform field they no longer cancel and a net force appears.

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