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Learn to solve a classic electrodynamics problem involving a sliding metal rod in a magnetic field through this 16-minute physics lecture. Work through Problem 7.7 from Griffiths Electrodynamics, which examines a metal bar of mass m sliding frictionlessly on two parallel conducting rails separated by distance l, with a resistor R connected across the rails and a uniform magnetic field B pointing into the page. Calculate the current in the resistor when the bar moves with speed v and determine its direction, analyze the magnetic force acting on the bar, derive the speed as a function of time when the bar starts with initial speed v0, and verify energy conservation by confirming that the energy delivered to the resistor equals the initial kinetic energy of the system.
