Question

Two wires of equal lengths are bent in the form of two loops. One of the loops is square shaped whereas the other loop is circular. These are suspended in a uniform magnetic field and the same current is passed through them. Which loop will experience greater torque? Give reasons.

Answer 1

For a wire of given length, the circular loop encloses greater area than the square loop. As, torque `tau=IAB`, i.e., `taupropA`, so the circular current loop will experience greater torque in the magnetic field.