1.

The earth's magnetic induction at a certain point is \[7\times {{10}^{-5}}Wb/{{m}^{2}}.\] This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius 5 cm. The required current in the loop is [MP PET 1999; MP PMT 2002]

A.    0.56 A        
B.    5.6 A
C.    0.28 A        
D.    2.8 A
Answer» C.    0.28 A        


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