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?

How does the self inductance of an air coil change, when an iron rod is introduced in the coil?

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.

An inductor L of inductance X_L is connected in series with a bulb B and an source. How would brightness of the bulb change when the number of turns of the inductor is reduced an iron rod is inserted in the inductor and a capacitor of reactance X_C=X_L is inserted in series in the circuit. Justify your answer in each case.

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?

An inductor L of inductance X_(L) is connected in series with a bulb B and an AC source . How would brightness of the bulb change when number of turns in the inductor is reduced

An inductor L of inductance X_(L) is connected in series with a bulb B and an AC source . How would brightness of the bulb change when a capacitor of reactance X_(C)=X_(L) is inserted in series .

A wire connected to a bulb does not glow, whereas the filament of the bulb glows when the same current flows through them.Why?

How do the properties of iron changes when nickel and chromium are mixed with it.