An air coil solenoid is connected to an a.c. sources and a bulb. If an iron core is insernted in the solenoid, how does the brightness of the bulb change? Give reason for your answer.

A solenoid with an iron core and a bulb are connected to a d.c. source. How does the brightness of the bulb change, when the iron core is removed from the solenoid?

An air-core solenoid having N turns and length l is carrying a current I ampere . If an iron core is inserted in it, how is its field modified?

As shown in figure an electric lamp having coil of negligible inductance conneted in series with a capacitor and an a.c. source is glowing certain brightness. How does the brightness of the lamp change on reducing the frequency. justify your answer.

As shown in figure an electric lamp having coil of negligible inductance conneted in series with a capacitor and an a.c. source is glowing certain brightness. How does the brightness of the lamp change on reducing the capacitance. Justify your answer.

A bulb and a capacitor are connected in series to an a.c. source of variable frequency. How will the brightness of the bulb change on increasing the frequency of a.c. source?

A coil and an electric bulb are connected in series with an ac. Source. On introducing a soft iron bar inside the coil, the intensity of the bulb will