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An equilateal triangle is made by unifor...

An equilateal triangle is made by uniform wires AB, BC, CA. A current I enters at A and leaves from the mid point of BC. If the length of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is

A

`(mu_(0))/(4pi) ((4l)/(L))`

B

`(mu_(0))/(2pi) ((4l)/(L))`

C

`(mu_(0))/(4pi) ((2l)/(L))`

D

zero

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