JEE Main 18 March 2021 Shift 1 Solved Paper

A loop of wire will act like magnetic dipole. In equilibrium, direction of dipole will be parallel to direction of magnetic field and its plane remains normal to the field.Now on each element of wire force due to magnetic field will be perpendicular to length of element and outward in direction. So, loop will become circular.
Hence, the correct option is (a).