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Movement of a wire in a magnetic field.

If a loop of wire is moved in a magnetic field, it produces a voltage across its ends that can be measured on a voltmeter, resulting from the change in the magnetic flux linking the coil.

If a resistor is connected across the ends, a current will flow and a force is needed to move the wire in the magnetic field. The energy supplied by the movement of the coil appears as electrical energy in the resistor, heating it up.

That is the principle of an electric generator.

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