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  4. Two thick wires and two thin wires, all of same material and same length, form a square in three different ways P, Q and R as shown in the figure. With correct connections shown, the magnetic field due to the current flow, at the centre of the loop will be zero in case of...........

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Q. Two thick wires and two thin wires, all of same material and same length, form a square in three different ways $P, Q$ and $R$ as shown in the figure. With correct connections shown, the magnetic field due to the current flow, at the centre of the loop will be zero in case of...........Physics Question Image

KCETKCET 2010Moving Charges and Magnetism

Solution:

In $P$ and $R$, current divides equally in two halves because of equal resistances in the two halves. Due to equal currents in two halves the current at the centre will be zero.