Doubt: a coil and bulb are connected in series with a DC source, a soft iron is then inserted then A. intensity of bulb remain same B. intensity of bulb decreases C. intensity of bulb increases D. bulb ceases to glow Sir please give answer and sir if AC supply given then what will be the option. please answer both question Chapter: Electromagnetic Induction - Subject: Physics - Course: NEET Course

a coil and bulb are connected in series with a DC source, a soft iron is then inserted then

A. intensity of bulb remain same

B. intensity of bulb decreases

C. intensity of bulb increases

D. bulb ceases to glow

Sir please give answer

and sir if AC supply given then what will be the option.

please answer both question

As iron rod is nserted, the magnetic field inside the coil magnetizes the iron increasing the magnetic field inside it.

hence the inductance of the coil increases. consequently the inductive reactance of the coil increases.

glow of the bulb increases.

In case of DC source, brightness remains unchanged. As the reactance offered by a coil to D.C. current is zero