16. A bar of length L = 2 meters slides with a speed v = 30 m/s along the rails of a U-shaped conductor. A magnetic field B = 0.5 T exists within the region and is perpendicular to the plane of the conductor. The bar has a resistance of 10 12, and the conductor has negligible resistance. (a) What EMF is induced in the (b) What current is induced in the (c) What external force must be bar? circuit? exerted on the bar to keep its speed constant