The answer option which best compares how magnetic fields are used in electromagnets and generators is: C. In an electromagnet an electric current is used to produce a magnetic field, in a generator a magnetic field is used to produce an electric current.
Electromagnets are typically constructed with coils of wire, which allow the passage of electricity (current) through them.
Hence, these electric current flowing through the coils of wire creates a magnetic field around the wire, which is what is used in making a magnet.
In a generator, an e.m.f is induced across a wire when it moves through the magnetic field between the poles of a magnet.
The mode of operation of a generator is that a metal core with copper tightly wound to it (conductor coil) rotates rapidly between the two (2) poles of a horseshoe magnet type.
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