1. The problem statement, all variables and given/known data A small circular flexible loop of wire of radius R carries a current I. It is placed in a uniform magnetic field B. The tension in the loop will be double if A) I is doubled B) B is halved C) r is doubled D) both B and I are doubled. 2. Relevant equations 3. The attempt at a solution (Assuming B to be inside plane of paper and I to be clockwise) The way I am looking at the problem is that because the loop is flexible its area will increase and because of the increase in area that total flux passing through the loop will also increase. This change in flux will induce an EMF which leads to an anticlockwise current, thereby reducing net current. I think we then have to find a relation between I and r but I can't understand how to do it. I don't even know if this is correct way to approach. Please help.