Question
Question: Switch S is closed at t = 0. After sufficiently long time, an iron rod is inserted into the inductor...
Switch S is closed at t = 0. After sufficiently long time, an iron rod is inserted into the inductor L. Then, the light bulb
A
Glows more brightly
B
Gets dimmer
C
Glows with the same brightness
D
Get momentarily dimmer and then glows more brightly
Answer
Gets dimmer
Explanation
Solution
: As the rod is inserted, inductance increases and hance the voltage across inductor increases. This causes a drop in the voltage across the bulb and hence it gets dimmer.