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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

$4 \times 10^{- 7}$ towards north

b

$4 \times 10^{- 7}$ towards south

c

$2 \times 10^{- 7}$ towards north

d

$2 \times 10^{- 7}$ towards north

answer is C.

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Detailed Solution

$B = \frac{μ_{0} i}{2 π r}, s o u t h$

$B = 2 \times 10^{- 7} \times 1 T$

$= 2 \times 10^{- 7}$ towards north

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