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A square loop is made by a uniform conductor wire as shown in figure
The net magnetic field at the centre of the loop if side length of the square is a
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The net magnetic field at the centre of the loop if side length of the square is a
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zero
The current will be equally divided at junction $P$. The field at the centre due to wires $P Q$ and $S R$ will be equal in magnitude but opposite in the direction, so its effective field will be zero. Similarly, net field due to wires $P S$ and $Q R$ is zero. Therefore, the net field at the centre of the loop is zero.
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