Question

i. Which of the following is NOT part of an electromagnet?
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Answer 1

Answer:

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

Answer 2

A (c) bamboo stick is NOT part of an electromagnet.

The question is incomplete. The complete Question is as follows:

Which of the following is NOT part of an electromagnet?

O a) conducting wire

O b)  Iron

O c) bamboo stick

O d) Power source

Explanation:

• Among the options, option C) bamboo stick is correct because the bamboo stick is not used in an electromagnet.

• All the other three options O conducting wire, O Iron, and O Power source, are incorrect because they are the part of an electromagnet.

Making of an electromagnet:

• A soft iron core is taken to make an electromagnet, and an insulated copper wire is wound around it.

• The two ends are joined to a power source i.e., a battery and a key.

Use of an electromagnet :

In cranes to lift cars and other vehicles, strong electromagnets are used.

The strength of the electromagnet depends upon:

(i) Number of turns

(ii) Current flowing  

(iii) Length of the air gap

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