of coil 1 with respect to
coil 2
(a) increases when they are brought nearer
(b) depends on the current passing through the coils
(c)
increases when one of them is rotated about an axis
(d) is the same as 
of
coil 2 with respect to
coil 1
Answer:
(a,d)The mutual
inductance 
of coil 1 with respect to
coil 2 increases when they are brought nearer. Further, 
The choices (a) and (d)
are correct.
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