How would the self-inductance, L , of a solenoid change if you would double its

Question

How would the self-inductance, L, of a solenoid change if you would double its radius and its length keeping the number of turns per unit length fixed? L would increase by a factor of 8. L would be doubled. L would decrease by a factor of 8. L would not change. L would be quadrupled. How would the self-inductance, L, of a solenoid change if you would double its radius and its length keeping the number of turns per unit length fixed? L would increase by a factor of 8. L would be doubled. L would decrease by a factor of 8. L would not change. L would be quadrupled. L would increase by a factor of 8. L would be doubled. L would decrease by a factor of 8. L would not change. L would be quadrupled.

Explanation / Answer

L = ?*N^2*A/l

L would increase by a factor of 8.

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