Section-E: Numerical Problems
A thin uniform rod with negligible mass and length l = 1.0m is attached to the floor by a frictionless hinge at point P. A horizontal spring with force constant k = 100 N/m connects the other end to wall. The rod is in a uniform magnetic field B = 8T directed into the plane of paper. What is extension in spring (in c.m) in equilibrium when a current I = 1.0 A is passed through the rod in direction shown. Assuming spring to be in natural length initially and it remains perpendicular to wall always.