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

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

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?

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

Explain self induction of a coil and give its unit.

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?

A coil is wound on a frame of rectangular cross - section. If all the linear dimensions of the frame are increased by a factor 2 and the number of turns per unit length of the coil remains the same, self - inductance of the coil increases by a factor of