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A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then

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Intensity of the bulb remains the same

Intensity of the bulb increases

Intensity of the bulb decreases

The bulb ceases to glow

answer is A.

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Detailed Solution

There will be self induction effect when soft iron core is inserted. The reactance offered by the coil to a DC current is zero. Intensity depends only on resistance. So the bulb glow with same intensity.

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