A metallic wire is folded to form a square loop a side `\'a\'`. It carries
Channel: Doubtnut
Date: 16/02/2020

A metallic wire is folded to form a square loop a side `\'a\'`. It carries a current `\'I\'` and is kept perpendicular to a uniform magnetic field. If the shape of the loop is changed from square to a circle without changing the length of thw wire and current, the amount of work done in doing so is