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

How does the self inductance of an air coil change, when the number of turns in the coil is decreased?

How does the mutual inductacne of a pair of coils get affected when a tahin iron sheet is placed between the two coils, other factors remaining the same?

How does the mutual inductacne of a pair of coils get affected when distance between coils is increased? Explain your answer in each case?

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?

Explain self induction of a coil and give its unit.

How does the mutual inductacne of a pair of coils get affected when the number of turns in each coil is decreased? Explain your answer in each case?

An air cored coil L and a bulb B are connected in series to the a.c. mains as shown in the given figures SAQ. 41: The bulb glows with some brightness. Now will the glow of the bulb change if an iron rod is insertd in the coil? Give reasons in support of your answer.