Two thick wires and two thin wires all of the same materials and same length form a square in the three different ways P Q and R

Question

Two thick wires and two thin wires all of the same materials and same length form a square in the three different ways P Q and R as shown in figure with current connection shown The magnetic field at the centre of the square is non zero in cases P 1 in Q only 3 in Q and R only R 2 in P and Q only 4 P and R only

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