A conducting rod of resistance R= 2.0 N is free to slide without friction on parallel con- ducting rails separated by a distance h = 0.45 m. A magnetic field B perpendicular to the rails and into the page. At one end the two rails are attached to an external voltage source with emf E The initial velocity of the rod at t = 0 is vo = 25 m/s to the right. (a) Calculate the current I in the rod at t=0. Specify whether the current flows "up" or "down" in the rod. 0.200 T is oriented Vo h B 12 V.
A conducting rod of resistance R= 2.0 N is free to slide without friction on parallel con- ducting rails separated by a distance h = 0.45 m. A magnetic field B perpendicular to the rails and into the page. At one end the two rails are attached to an external voltage source with emf E The initial velocity of the rod at t = 0 is vo = 25 m/s to the right. (a) Calculate the current I in the rod at t=0. Specify whether the current flows "up" or "down" in the rod. 0.200 T is oriented Vo h B 12 V.
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For a, the answer gives that the induced emf is up, and the current is down. Why specifically is the induced emf up? and why is the current down? Thanks!
(notice: this is not a graded question, it's a practice problem that comes with an answer which I don't quite understand)
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