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A current loop in a uniform magnetic field experiences

  • A.a net force along the direction of the field
  • B.a torque but no net force
  • C.a net force but no torque
  • D.neither a force nor a torque

Answer: B

The forces on opposite sides of the loop are equal and opposite, so they cancel as a resultant but constitute a couple. A net force appears only in a non-uniform field, which is why a small magnet is drawn toward the pole of a larger one.

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