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Question
A thin, 50.0-cm-long metal
bar with mass 750 g rests on, but is
not attached to, two metallic supports
in a uniform 0.450 T magnetic field, as
shown in Fig. . A battery and a
25.0 Ω resistor in series are connected
to the supports. (a) What is the highest
voltage the battery can have without
breaking the circuit at the supports?
(b) The battery voltage has the maximum value calculated in part (a). If the
resistor suddenly gets partially short-circuited, decreasing its resistance to
2.0 Ω, find the initial acceleration of the bar
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