By inserting a soft iron piece into a solenoid, strength of the magnetic field

increases

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decreases

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first increases then decreases

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remains unchanged

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Solution

The correct option is A increases
Soft iron placed in the core get magnetised due to the magnetic field produced by the current carrying solenoid and hence the net magnetic field will be sum of both.

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Why solenoid are used to magnetise a piece of magnetic materials, like soft iron, when placed inside the coil?

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