A) 16
B) 12
C) 8
D) 4
Correct Answer: C
Solution :
Self inductance \[L={{\mu }_{0}}{{N}^{2}}A/l={{\mu }_{0}}{{n}^{2}}lA\] Where n is the number of turns per unit length and N is the total number of turns and \[N=nl\] In the given question n is same. A is increased 4 times and l is increased 2 times and hence L will be increased 8 times.
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