A long straight wire is fixed along the north–south direction and passes vertically through the centre of a horizontal square loop of side 40 cm that lies on a wooden table. The wire carries a current of 25 A upward. The square loop carries a current of 4 A anticlockwise when viewed from above.
Using this configuration, answer the following questions:
(i) Calculate the magnitude of the magnetic field produced by the straight wire at the midpoint of the eastern side of the square loop.
(ii) Determine the magnitude and direction of the force acting on the eastern side of the square loop.
(iii) State, with reason, whether the net force acting on the entire square loop is zero or non-zero.