Q.

Two concentric circular coils of ten turns each are situated in the same plane. Their radii are 20 cm and 40 cm and they carry 0.2 A and 0.3 A current, respectively, in opposite direction. The magnetic field in weber/m2 at the centre is

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a

354 μ0

b

μ080

c

780 μ0

d

54 μ0

answer is D.

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Detailed Solution

Two coils carry current in opposite direction, hence net magnetic field at centre will be difference of the two fields.i.e.,    Bnet = μ04π . 2πN i1r1 − i2r2 = 10μ02  0.20.2 − 0.30.4 = 54 μ0
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