If in a circular coil A of radius R, current i is flowing and in another coil B of radius 2R a current 2i is flowing, then the ratio of the magnetic fields, B A and B B produced at the centre by them will be:
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Verified by ExpertsThe correct answer is:
A
Magnetic field in circular coil 
is
Similarly, 
is radius and 
is current flowing in coil.
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