Question

State and define the SI unit of self inductance. Give its dimensions. 

OR 

Write the SI unit and dimensions of the coefficient of self induction.

Answer 1

The SI unit of self inductance or coefficient of self induction or inductance as it is commonly called is called the henry (H).

The self-inductance of a coil is 1 henry, if an emf of 1 volt is induced in the coil when the current through the same coil changes at the rate of 1 ampere per second.

The dimensions of self inductance or coefficient of self induction are [ML²T^-2 I^-2 ].

1 henry = 1 H = 1 V/A.s = 1 T.m² /A

[ Note : The unit henry is named in honour of Joseph Henry (1797-1878) US physicist.]