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A bar 30 cm long is sliding freely on two long wires in the presence of...

A bar 30 cm long is sliding freely on two long wires in the presence of a magnetic field at 20 m/s going right (in the positive x direction). Connecting the two wires at their ends on the far right side is a 40 ohm resistor. What is the strength and direction of the magnetic field to produce a current of 50 mA in a counterclockwise direction through the loop of the circuit?

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