Electromagnetic Induction and Alternating Current

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Multiple Choice

A 20-turn square coil of side 8.0 mm is pivoted at the centre and placed in a magnetic field of flux density 0.010 T, such that two sides of the coil are parallel to the field and two sides are perpendicular to the field. A current of 5.0 mA is passed through the coil. What is the magnitude of the torque acting on the square coil?

  1. 0.1 x 104 N m
  2. 0.1 x 10-8 N m
  3. 6.4 x 10-8 N m
  4. 62.5 x 108 N m
  5. 0.025 x 10-4 N m
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