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What is a solenoid ? Mention two ways to...

What is a solenoid ? Mention two ways to increase the strength of the field of a solenoid

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A coil of many circular turns of insulated copper wire wrapped closely in the shape of cylinder is called a solenoid.
Two ways to increase the strength of the field of a solenoid
(i) By increasing the number of turns.
(ii) By increasing current.
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