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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

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) B=( x 2k) 4 R Ho 1 (b) B= 4 R (c) B=(n - 2k) (d) B= (n + 2k) 4 R Ho 1 4 R - (n + 2k) Z

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