The earth’s magnetic field at a given point is $0.5×{10}^{-5}Wb-{m}^{-2}.$ This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0cm. The current required to be flown in the loop is nearly

(a) 0.2 A                   (b) 0.4A

(c) 4A                       (d) 40A

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