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  4. Following is equilateral triangle shape loop, whose one arm produces magnetic field B at the centre. The resultant magnetic field due to all the arms will be :-

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Q. Following is equilateral triangle shape loop, whose one arm produces magnetic field $B$ at the centre. The resultant magnetic field due to all the arms will be :-Physics Question Image

Moving Charges and Magnetism

Solution:

All the wires will produce magnetic field of magnitude $B$, out of the plane of paper.
So, $B_{\text {net }}=3 B$