Ans. (a) solenoid, (b) electromagnet, (c) electric relay.
Show with the aid of a diagram how a wire is
wound on a U-shaped piece of soft iron in order to
make it an electromagnet. Complete the circuit
diagram and label the poles of the electromagnet.
What is an electromagnet ? Name two factors on
which the strength of magnetic field of an electro-
magnet depends and state how does it depend on
the factors stated by you.
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Answer:
a solenoid only the answer
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