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The magnitude of magnetic field at a point having perpendicular distance 50 mm from a long straight conducting wire carrying a current of 3A is

a
0.12 G
b
1.2 G
c
12 G
d
0.012 G

detailed solution

Correct option is A

B=μ0i2πr=2×10−7×350×10−3T=0.12×10−4T=0.12Gauss

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