## Question

###### Acopper rod of length 0.79 m is lying on a frictionless table (see the drawing). Each end ofthe rod is attached to afixed wire by an unstretched spring that has a spring constant of k=73 Nlm.A magnetic field with a strength of 0.28 T is oriented perpendicular to the surface of the table: (a) What must be the direction of the current in the copper rod that causes the springs to stretch? (b) If the current is 11A by how much does each spring stretch? Table (top view)Fied wires(out of paper)Copper

Acopper rod of length 0.79 m is lying on a frictionless table (see the drawing). Each end ofthe rod is attached to afixed wire by an unstretched spring that has a spring constant of k=73 Nlm.A magnetic field with a strength of 0.28 T is oriented perpendicular to the surface of the table: (a) What must be the direction of the current in the copper rod that causes the springs to stretch? (b) If the current is 11A by how much does each spring stretch? Table (top view) Fied wires (out of paper) Copper rod (a) Direction (b) Number Units

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