Infinite number of straight wires each c...

Infinite number of straight wires each carrying current I are equally placed as shown in the figure Adjacent wires have current in opposite direction Net magnetic field at point `P` is
.

A

`(mu_(0)I)/(4pi)(In 2)/(sqrt(3)a)hatk`

B

`(mu_(0)I)/(4pi)(In4)/(sqrt(3)a)hatk`

C

`(mu_(0)I)/(4pi)(In4)/(sqrt(3)a)(-hatk)`

D

Zero

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