An insulated copper wire is wound around a steel nail and current is passed for some time. The nail will change to a:

permanent magnet

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temporary magnet

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will not get magnetised

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none of the above

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Solution

The correct option is B
temporary magnet

Explanation of correct option:
(b) Electromagnetism is a process in which when a piece of iron is kept in a electric field then after some time it will show magnetism.
Its magnetism will be lost as soon as the electric current is turned off.
So, it is a temporary magnet.
Explanation of incorrect option:
(a) Naturally occurring magnet are permanent magnet.
(c) Electric current passing through a circuit shows magnetic behaviour so a iron nail will get magnetised when kept in an electric field.
(d) None of the above.
So, the correct option is (b).

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Question 17

Your teacher has shown you the following activity

Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity

Q. If we let current pass through a coil wound around an iron nail for long ,can the nail transform into a permanent magnet?

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