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The earth's magnetic field at a certain ...

The earth's magnetic field at a certain point is 0.70 gauss. This field is to be annulled by the magnetic field at the centre of a circular conducting loop 5.0 cm in radius. The required current is about

A

0.66 A

B

5.6 A

C

0.28 A

D

2.8 A

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The correct Answer is:
b
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