Figure shows a square loop \( A B C D \) with edge length \( a \). The resistance of the w...
Figure shows a square loop \( A B C D \) with edge length \( a \). The resistance of the wire \( A B C \) is \( r \) and that of \( A D C \) is \( 2 r \). Find the magnetic field \( B \) at the centre of the loop assuming uniform wires.
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