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Q.

A long straight horizontal wire carries a current of 1 A in the east to west direction. What is the magnitude and direction of the magnetic field induction due to be current 1 m below the conductor?

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a

4×10−7 towards north

b

4×10−7 towards south

c

2×10−7 towards north

d

2×10−7 towards north

answer is C.

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Detailed Solution

B=μ0i2πr, south

B=2×10-7×1 T

=2×10−7 towards north

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