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Questions  

A coil of wire of a certain radius has 600 turns and a self inductance of 108 mH. The self inductance of a 2nd  similar coil of 500 turns will be

a
74 mH
b
75 mH
c
76 mH
d
77 mH

detailed solution

Correct option is B

LBLA=nBnA2⇒LB=5006002×108=75 mH

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