An iron rod is inserted in the inductor, what will be the effect on the brightness of the bulb?

Options

A. Intensity of the bulb remains the same.
B. Intensity of the bulb decreases.
C. Intensity of the bulb increases.
D. The bulb ceases to glow.

Answer

B

Explanation

When a soft iron core is inserted in the inductor, the magnetic flux incrases. According to Kenz.s law, it will be resisted by reducing the current. Since the current reduces, the intersity of the bulb decreases.