Two conducting circular loops of radii 
and 
are placed in the same plane with their centres coinciding. If 
, the mutual inductance 
between them will be directly proportional to
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let a current 
flows through the outer circular coil of radius 
.
The magnetic field at the centre of the coil is 
As the inner coil of radius 
placed co-axially has smaller radius ( 
), therefore 
may be taken to be constant over its cross-sectional area.
Hence, flux associated with the inner coil is
As 
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