two frictionless conducting rails (#1 and #2) are attached to a 20.0° incline such that the inside edges are 80.0 cm apart. A copper bar with a mass of 0.162 kg slides (without friction) at a constant speed down the conducting rails.   If there is a vertical magnetic field of 0.0396 T in magnitude in the region of the incline, determine the magnitude of the current I that flows through the sliding copper bar. I =

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