Two stiff parallel wires a distance l apart in a

Chapter 15, Problem 75GP

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Two stiff parallel wires a distance  apart in a horizontal plane act as rails to support a light metal rod of mass  (perpendicular to each rail). Fig.  A magnetic field \(\vec{B}\). directed vertically upward (outward in the diagram), acts throughout. At \(t=0\), wires connected to the rails are connected to a constant current source and a current  begins to flow through the system. Determine the speed of the rod, which starts from rest at \(t=0\), as a function of time

 

(a) assuming no friction between the rod and the rails, and

 if the coefficient of friction is \(\mu_{k}\).

(c) Does the rod move east or west if the current through it heads north?

FIGURE 20-66 Looking down on a rod sliding on rails. Problem 75 .

Equation Transcription:

     

   

   

Text Transcription:

\vec{B}

t=0

t=0

\mu_{k}