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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 fig with current connections shown, the magnetic field at the centre of the square is zero in cases

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In P only

In P and Q only

In Q and R only

P and R only

answer is D.

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Detailed Solution

In P and R loops, currents are divided in same proportion because the branches have equal resistance. Hence magnetic field produced at centre due to each segment is of equal magnitude but of opposite direction, so net field is zero.

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