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

Step-by-step solution

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.