Two conducting circular loops of radii R l and R 2 are placed in the same plane with their centres coinciding. If R 1 > R 2 the mutual inductance M between them will be directly proportional to
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Text Solution
Verified by ExpertsThe correct answer is:
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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 small radius 
therefore 
maybe taken constant over its cross sectional area.
Hence flux associated with the inner coil is
As 
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