Which of the following methods can be used to increase the strength of an electromagnet?

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Increasing the current through the coil.

Increasing the number of turns in the coil.

By inducing the length of the air gap between the poles

All the above.

answer is D.

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Detailed Solution

All the 3 methods can be used to increase electromagnetic strength.
We know that an electromagnet is formed by passing an electric current through a current-carrying conductor. An induced current will be produced due to cutting the magnetic flux lines of a magnet, and an induced magnetic field will be produced around a current-carrying conductor. So we can increase the strength of the electromagnet by increasing the electric current passing through it. If the number of turns of the coil increases, then the current will increase, and the strength of the electromagnet will increase, also by increasing the length of the air gap between the poles.

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