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Questions  

An infinitely long wire carrying current I is along Y axis such that its one end is at point A (0, b) while the wire extends upto +. The magnitude of magnetic field strength at point (a, 0) is

a
μ0i4πa  1+ba2 + b2
b
μ0i4πa  1-ba2 + b2
c
μ0i4πa  ba2 + b2
d
None of these

detailed solution

Correct option is B

B= μ04π Ia  sin 900 +  sin −θ  =  μ04π Ia 1−sin θ=μ04π Ia  1−ba2 + b2

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