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
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a
μ0i4πa 1+ba2 + b2
b
μ0i4πa 1-ba2 + b2
c
μ0i4πa ba2 + b2
d
None of these
answer is B.
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Detailed Solution
B= μ04π Ia sin 900 + sin −θ = μ04π Ia 1−sin θ=μ04π Ia 1−ba2 + b2