Two concentric circular coils often turns each are situated in the same plane. Their radii are 20 and 40 cm and they carry respectively 0.2 and 0.3 ampere current in opposite direction. The magnetic field in 
at the center is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Two coils carrying current in opposite direction, hence net magnetic field at center will be difference of the two fields.
i.e., 
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