Infinite number of straight wires each carrying current I are equally placed as shown in the figure Adjacent wires have current

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)l In2)/(4pisqrt(3a))hatK`
B. `(mu_(0)l In4)/(4pisqrt(3a))hatK`
C. `(mu_(0)l In4)/(4pisqrt(3a))(-hatK)`
D. zero

Infinite number of straight wires each carrying current I are equally placed as shown in the figure Adjacent wires have current in opposite direction

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