The conducting rod shown in the figure 30-56 has length L and is being pulled al

Question

The conducting rod shown in the figure 30-56 has length Land is being pulled along horizontal, frictionless, conductingrails at a constant velocity. The rails are connected at one endwith a metal strip. A uniform magnetic field, directed out of thepage, fills the region in which the rod moves. Assume thatL = 11 cm, the speed of the rod is v = 6.5 m/s,and the magnitude of the magnetic field is B = 1.8 T.(a) What is the magnitude of emf induced in voltsin the rod? (b) What is the current in amperes inthe conducting loop? Assume that the resistance of the rod is 0.56 and that the resistance of the rails and metal strip isnegligibly small. (c) At what rate is thermalenergy being generated in the rod? (d) What forceon the rod is needed to maintain its velocity? (e)At what rate does this force do work on the rod?

so I got parts A,B,D,E correct. Just need part C.

is the eqn for partC: p= i^2 (R)

I got i to be i = 2.1A if thats any help. Thanks!

Explanation / Answer

Just Solve for P P=IV or P=I^2*R Just Solve for the Voltage across the rod like you did

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