A wire carrying current I has the shape...

A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semicicular portion of radius `R` is lying in `Y-Z` plane. Magnetic field at point `O` is

`vecB = - (mu_0)/(4pi) I/R (mu hati xx 2 hatk)`

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

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

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

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