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  4. An equilateral 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 lengths of each side of the triangle is L, the magnetic field B at the centroid O of the triangle is

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Q. An equilateral 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 lengths of each side of the triangle is $L$, the magnetic field $B$ at the centroid $O$ of the triangle isPhysics Question Image

WBJEEWBJEE 2013Moving Charges and Magnetism

Solution:

The given situation can be shown as
image
The magnetic field at centroid $O=$ Magnetic field due to left part + Magnetic field due to right part $\therefore B = B _{1}+ B _{2}=0$
$(\because$ direction of B due to both parts is different of $O$ )