A Metal Bar With Length L, Mass M, And Resistance R Is Placed On Frictionless Metal Rails That Are Inclined At An Angle ? Above The Horizontal. The Rails Have Negligible Resistance. A Uniform Magnetic Field Of Magnitude B Is Directed Downward In The Figure (Figure 1). The Bar Is Released From Rest And Slides Down The Rails.

 

A metal bar with length L, mass m, and resistance R is placed on frictionless metal rails that are inclined at an angle above the horizontal. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed downward in the figure (Figure 1). The bar is released from rest and slides down the rails.