A big circular coil with turns and an average radius of is rotating about its horizontal diameter at a rate of . The vertical component of the Earth's magnetic field at that location is , and the electrical resistance of the coil is . The maximum induced current in the coil will be:
2 A
0.25 A
1.5 A
1 A
The maximum induced electromotive force () in a rotating coil is given by the formula , where: is the number of turns (). is the magnetic field (). is the area of the coil (). is the angular velocity ().
The maximum induced current () is given by Ohm's law: .
Substituting the values:
Noting that : .
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