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Standard XII
Physics
Question

The earth's magnetic induction at a certain point is 7×10−5Wb/m2. This is to be annulled by the magnetic induction at the centre of a circle conducting loop of radius 15 cm. The required current in the loop is
  1. 0.56A
  2. 5.6A
  3. 0.28A
  4. 2.8A

A
0.28A
B
2.8A
C
0.56A
D
5.6A
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