CUET Preparation Today
A bulb and an iron core inductor are connected to an AC source through key as shown in figure :
The bulb glows with certain brightness. Now iron rod is taken out of the inductor. Then the brightness of bulb. |
increases decreases is uncharged first increases then decreases |
increases |
When the iron rod is taken out , the magnetic field inside the solenoid is decreased. This decreases the inductance of the solenoid.So , the inductive reactance of the solenoid decreases hence the brightness increases. |
