A solenoid with an iron core and a bulb are connected to an a.c. source. The bulb is glowing with certain brightness. When the iron core is removed from the solenoid, the brightness of the bulb
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → increases
When a solenoid has an iron core, its inductance is higher, leading to greater self-induced emf in opposition to the applied AC, which limits current through the bulb. Removing the iron core reduces the inductance, allowing more current to pass through the bulb.
✅ Therefore, the brightness of the bulb increases.