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Here is the problem which I am struggling on, please help me!

Problem: Two resistance less rails rest 22cm apart on a 5.0?ramp. They are joined at the bottom by a 0.75 ohm resistor. At the top a copper bar of mass 0.040 kg (ignore its resistance) is laid across the rails. The whole apparatus is immersed in a vertical 0.85T field.

A- What is the terminal (steady) velocity of the bar as it slides frictionless down the rails?

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