The coefficient of self inductance and the coefficient of mutual inductance have

The coefficient of self inductance of a coil is

Define coefficient of mutual induction,

What is mutual induction? Find the coefficient of mutual induction and also define S.I. unit of mutual induction.

What is the SI unit of coefficient of mutual inductance?

The dimensions of coefficient of self inductances are

The dimensions of coefficient of self inductances are

(a) Explain the phenomenon of self -inductance . (b) Define coefficient of self - induction and give its unit.