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two loops of wire of radii 1cm and 2cm resp.are placed coaxialy .current i passes through both in same direction initialyand then the the direction of current is reversed . what is the ratio of magnetic induction at centre in first and second case
Dear darshan joshi
magnetic field at the center of loop of radius a is
B = μ i/2a
first case
B=B1 +B2
= μi/2*1 + μ i/2*2
= μi/2 [ 3/2]
second case
B' = B1 -B2
=B1 +B2
= μi/2*1 - μ i/2*2
= μi/2 [ 1/2]
so B/B' = 3
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