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Which will not Induce an EMF in a coil of wire

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Which of the following cases will NOT induce an EMF in a coil of wire? (True/False problem)

1) By increasing the magnetic field in which a wire coil sits.

2) By rotating a coil of wire counter-clockwise in a constant magnetic field.

3) By pushing a bar magnet into a coil of wire.

4) By decreasing the area of a coil placed in a constant magnetic field.

5) By leaving a coil of wire in a constant magnetic field.

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Solution Summary

Provides steps necessary to determine what will not induce an EMF in a coil of wire.

Solution Preview

The induced emf is equal to
E = - N delta (flux)/delta (time)
= - N delta (magnetic field X area) / delta (time)

1) When you increase the magnetic field, B changes. delta B ...

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