A magnet which operates only when ________ flows through its insulated copper coil is called electromagnet.

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Solution

Electromagnet:
Electromagnets are made out of a coil of wire.
This effect can be strengthened by winding a wire tightly around a powerful core, made of magnetic material, such as iron.
When the electric current is stopped it behaves like a normal metal.
Magnetism is lost as soon as the electric current is turned off.
So, A magnet which operates only when electric current flows through its insulated copper coil is called electromagnet.

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Q. A substance consisting of a coil of wire with an iron core and is only magnetized when an electric current flows through it is called :

An insulated copper wire is wound on a soft iron core. Current is passed through the coil such that at end ‘A’ the current flows anti- clockwise and a magnetic compass needle placed at other end ‘B’ of the coil.

i) What polarity is created at B?

ii) How is the magnetic compass affected when current flows through the coil?

Give a reason for the following.

An electromagnet loses its magnetism when the current flowing through its coil is stopped.

A soft iron piece in an electromagnet, on which an insulated copper wire is wound, is called,

Q. When

100 V

D C

is applied across a coil, a current of

1 A

flows through it. When

100 V

A C

50 Hz

is applied to the same coil, only

0.5 A

current flows. Calculate the inductance of the coil.

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