2 concentric circular coils of 10 turns each are situated in the same plane. Their radii are 20cm and 40cm amd they carry a current of .2 and .3 A respectively in opp direction.The magnetic field in weber/m^2 at the centre is
a 35/4 mu0
b mu0/8
c 7/80 mu0
​5/4 mu0

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