Question

Consider the circuit shown in the figure, similar to the slide-wire generator weve discussed in class. The uniform magnetic field points out of the page with a constant magnitude of 0.50 T. The resistor has a resistance of 59.0 ?, and the resistance of the rest of the conductor is negligible by comparison. The bar has a length of 0.26 m and is moving to the left with a speed v. What is this unknown speed if the resistor dissipates 0.75 J of energy every second? You can safely assume the metal rails are long enough for this motion to happen

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