A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are c...

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A conducting bar rolls down a slope made of conducting rails. The bottom ends of the rails are connected by another conducting rail as shown in the figure. There is a uniform magnetic field \( B \) pointing upward. Due to the bars motion, there is an induced current in the bar-rail circuit.
What is the direction of the magnetic force on the bar?
(a) Up along the slope
(b) Down the slope
(c) Towards left (horizontal)
(d) Towards right (horizontal)
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