A bulb connected in series with an air-cored solenoid is lit by an a.c. source. If a soft iron core is introduced in the solenoid.

Options

A. The bulb stops glowing
B. The bulb will glow brighter.
C. There is no change in glow of bulb.
D. The bulb will become dimmer.

Answer

D

Explanation

By placing soft iron core inside solenoid its self induction increases, so p.d. between its two ends increases `(V=L(dI)/(dt))` and p.d. between two ends of bulb decreases. Hence, bulb will become dim.