A short bar magnet produces a field of induction 160×10−6T at a certain point on the axial line. The induction field strength on the same line at a point twice the distance of the first is
20×10−5T
2×10−5T
20×10−4T
2×10−7T
A
20×10−5T
B
2×10−5T
C
20×10−4T
D
2×10−7T
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