A wire carrying current I has the shape as shown in adjoining figure. Linear parts of the wire a...

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A wire carrying current I has the shape as shown in adjoining figure.

Linear parts of the wire are very long and parallel to X-axis while semicircular portion of radius R is lying in Y-Z plane. Magnetic field at point O is
(a) B⃗=-μ_0/4 πI/R(πî+2 k̂)
(b) B⃗=μ_0/4 πI/R(πî-2 k̂)
(c) B⃗=μ_0/4 πI/R(πî+2 k̂)
(d) B⃗=-μ_0/4 πI/R(πî-2 k̂).
(2015 Cancelled)
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After a long time, I found real explanation. Thank you sir❤

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