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A conducting rod of length $\ell$ moves on two horizontal frictionless rails, as in Figure $\mathrm{P} 20.30 .$ A constant force of magnitude 1.00 $\mathrm{N}$ moves the bar at a uniform speed of 2.00 $\mathrm{m} / \mathrm{s}$ through a magnetic field $\overrightarrow{\mathrm{B}}$ that is directed into the page. (a) What is the current in an $8.00-\Omega$ resistor $R ?(\mathrm{b})$ What is the rate of energy dissipation in the resistor? (c) What is the mechanical power delivered by the constant force?

a. 0.5 A

b. 2.00 \mathrm{W}

c. 2.00 \mathrm{W}

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