When a soft iron core is introduced in a coil, the strength of the magnetic field:

Increases

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Decreases

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Remains the same

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Will become 0

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Solution

The correct option is A
Increases

When a soft iron core is introduced, the strength of the magnetic field increases. In the given figure, the field due to the coil with the iron core will be greater than the field due to the coil if the iron core were not present.

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