A wire carrying current I has the shape ...

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:

`vecB = (mu_0)/ (4pi) I/R (pihati - 2hatk)`

`vecB = (- mu_0)/ (4pi) I/R (pihati + 2hatk)`

`vecB = (- mu_0)/ (4pi) I/R (pihati - 2hatk)`

`vecB = (mu_0)/ (4pi) I/R (pihati + 2hatk)`

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