A copper rod of length 0.50 m is lying on a frictionless table. Each end of the rod is attached to a fixed wire by an unstretched spring that has a spring
constant of k=50.0 N/m. A magnetic field of strength 0.25 T is oriented perpendicular to the surface of the table as shown.
- What must the direction of current be in the copper rod that causes the spring to stretch?
- If the current is 15A, by how much does each spring stretch?