Muffi the Super Dog pulls a metal bar of length L with constant speed v along two parallel horizontal frictionless metal tracks, as shown in the diagram.

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Presentation transcript:

Muffi the Super Dog pulls a metal bar of length L with constant speed v along two parallel horizontal frictionless metal tracks, as shown in the diagram. Between the tracks there is a constant magnetic field of magnitude B, directed vertically upward. A light bulb of resistance R is attached across the two tracks as shown. (a) What is the direction of the induced current through the wire connecting the light bulb to the tracks?

(b) Derive an algebraic expression for the speed v with which Muffi must run to generate power P0 in the light bulb. Start the problem only with equations from the equation sheet. Express your answer in terms of the parameters B, L, and R.