A rolling axle is pushed alonghorizontal rails, l = 0.723 m apart, at a constant

Question

A rolling axle is pushed alonghorizontal rails, l = 0.723 m apart, at a constant speedv = 0.299 m/s. A resistor R = 11.5 is connected to the rails at points a and b asshown in the diagram and is the only significant resistance in theloop. There is a uniform magnetic field B = 3.61 Tvertically downward. a) What is the induced currentin the resistor? Answer in units of A. b) What is the magnitude ofthe horizontal force F required to keep the axle rolling atconstant speed? Answer in units of N. c) Which end of the resistor(a or b) is at the highest potential while theaxle is still to the right of the resistor? d) After the axle rolls pastthe resistor, does the current through R reversedirection? e) Find the mechanical powerP. Answer in units of W. f) Find the dissipative powerin the resistor. Answer in units of W.

Explanation / Answer

Thank you so much! How do I figure out these two questions? Which end of the resistor (a orb) is at the highest potential while the axle is still tothe right of the resistor? After the axle rolls past the resistor, does thecurrent through R reverse direction?

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