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Q.

A straight conductor of length 32 cm carries a current of 30A. Magnetic induction at a point which is in air at a perpendicular distance of 12cm from the mid point of the conductor is

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a

0.5 gauss

b

0.3 gauss

c

0.2 gauss

d

0.4 gauss

answer is C.

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Detailed Solution

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sin⁡θ=16162+122=1620B=μ04πi×2sin⁡θd
=10−7×30×212×10−2×45=0.4×10−4=0.4 gauss

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