An electric motor can be manually turned and made to act as a generator.
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[Ques. 2] A speaker can be used as a crude microphone.
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[Ques. 3] A transformer only works with AC.
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[Ques. 4] Three devices that use electromagnetic induction in their operation are generators, transformers, and dynamic microphones.
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[Ques. 5] One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it.
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[Ques. 6] The shape of the magnetic field around a bar magnet is very close to the shape of the electric field around a single positive charge.
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[Ques. 7] Moving electric charges make magnetic fields.
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[Ques. 8] A stationary electric charge produces a magnetic field around it.
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[Ques. 9] There are positive and negative magnetic charges, analogous to positive and negative electric charges.
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[Ques. 10] The direction of a magnetic field at a point can be determined by a compass.
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