What is the torque on a rectangular coil whose plane is parallel to the magnetic field, as in a radial field?
Correct answer D. τ = NIAB
Explanation
Torque is τ = NIAB cos α, where α is the angle between the coil's plane and the field. When the plane is parallel to the field, cos 0° = 1 and the torque reaches its maximum, NIAB.
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