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Two long parallel wire P and W are both ...

Two long parallel wire P and W are both perpendicular to the plane of the paper with distance of 5 m between them . If P and W carry current of 2.5 A and 5A respectively in the same direction, then the magnetic field at a point half-way between the wires is

A

`(sqrt3mu_0)/(2pi)`

B

`(mu_0)/(pi)`

C

`(3mu_0)/(2pi)`

D

`(mu_0)/(2pi)`

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