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The illustration shows a sliding bar is placed at a distance of x sub 0 on a rectangular loop inside an outward magnetic field B. The loop has a constant width l, and length x sub 0 which is connected to a resistor R. A current I flows clockwise through the resistor R in the circuit. The motion of sliding bar induces a motional e m f V sub e m f sup m. A current element d I moves in the bar along the y axis.