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Question

If current in the coil decreases, the strength of the magnetic field

A
decreases
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B
increases
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C
sometimes decreases and sometimes increases
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D
remains unchanged
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Solution

The correct option is A decreases
The magnetic field inside a solenoid is given by
B=μ0nI
where n is the number of turns in coil per unit lenght,
I is the current through the solenoid
Hence when the current in the solenoid decreases, the strength of magnetic field B also decreases.

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