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

1. Intensity of the bulb remains the same
2. Intensity of the bulb decreases
3. Intensity of the bulb increases
4. The bulb ceases to glow

Correct answer: Intensity of the bulb decreases

Solution

Inserting a soft iron core increases the inductance of the coil. Due to self-induction, the coil opposes the rise of current, so the current in the series circuit decreases. Hence the bulb glows less brightly.

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