Question
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
zero
None of these
Solution
B.
zero
The current will be equally divided at junction P. The field at the centre due to wires PQ and SR will be equal in magnitude but opposite in the direction, so its effective field will be zero. Similarly, net field due to wires PS and QR is zero. Therefore, the net field at the centre of the loop is zero.
