Two conducting rails 30 centimeter apart rest on a 5o ramp, Ask an Expert

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Two conducting rails 30 centimeter apart rest on a 5^o ramp, they are joined at the bottom by a 0.60 Ω resistor, and at the top a copper bar of mass, 0.040 kilogram is laid across the rails. The whole apparatus is immersed in a vertical 0.55 T field. Compute the thermal velocity of the bar as it slides frictionless down the rails?

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