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Question

What is an electromagnet ? State two ways ways by which the strength of an electromagnet can be increased.

Solution
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When electric current is passed in a solenoid material like soft iron, the core becomes an electromagnet.
Strength of magnetic field in a solenoid is given by B=μ0nI
The strength of an electromagnet can be increased by
(i) increasing the current,
(ii) increasing the number of turns in the coil

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