Two concentric coils each of 10 turns are situated in the same plane. Their radii are 2 cm and 4 cm and they carry 0.2 A and 0.3 A currents respectively in opposite directions. The magnetic field (in 
) at the centre is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The given situation is shown below
At center O, magnetic field due to inner circular coil,
Similarly, at center O, magnetic field due to outer circular coil,
Net magnetic field, 
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