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A metal bar of mass m slides without friction over two rails a distance D apart in the region that has a uniform magnetic held of magnitude
perpendicular to the rails (see below). The two rails are connected at one end to a resistor whose resistance is much larger than the resistance of the rails and the bar The bar is given an initial speed of vg. It is found to slow down.
How far does the bar go before coming to rest? Assume that the magnetic held of the induced current is negligible compared to
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