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Electric Charges And Fields

Question
CBSEENPH12037903

If the number of turns of solenoid is doubled, keeping the other factors constant, how does the self-induction of the solenoid change?

Solution
Given, number of turns of solenoid is double keeping all other factors constant.

Coefficient of self induction is given by,

                   L = 0Al 

Therefore, when number of turns is doubled, the coefficient of self induction will increase 4 times of it's initial value.