Electromagnetic Induction Ques 18
18. Two coils of self inductances $2 $ $mH$ and $8$ $ mH$ are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is
[2006]
(a) $6 $ $mH$
(b) $4 $ $mH$
(c) $16 $ $mH$
(d) $10 $ $mH$
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Answer:
Correct Answer: 18.(b)
Solution:
- (b) Mutual Inductance of two coils
$M=\sqrt{M_1 M_2}=\sqrt{2 m H \times 8 m H}=4 $ $ m H$
It is not possible to have mutual inductance without self inductance but if may or may not be possible self inductance without mutual in ductance.
BETA
