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Inductors - Engineering

Q1:

When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

A is quartered

B quadruples

C doubles

D does not change

ANS:A - is quartered

Formula: W= 1/2 LI^2, inductor values kept same only current's value is cut into half or made half.

Example,

1) 1/2*6*10^2 = 300.
2) 1/2*6*5^2 = 75.

So 75/300 = 1/4 times decreased, that is quartered.