When Soft iron is placed inside a solenoid with which the bulb is connected in series, then glow of filament of bulb connected in that A.C circuit is?

Explanation

When soft iron is placed inside a solenoid, it increases the solenoid's magnetic field strength, thereby increasing the inductance of the circuit. In an AC circuit, increased inductance results in a decrease in current flow through the circuit. As a result, the bulb connected in series with the solenoid experiences a reduced current, causing its glow to decrease. Option A is incorrect as it suggests an increase in glow, which would happen only if inductance decreased. Option C is incorrect because the glow does not remain the same; it changes with the current. Option D is incorrect because the bulb does respond to the change in inductance.