Magnetic Force on a Sliding Bar

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A conducting bar (green) moves over two frictionless parallel rails (yellow) with a resistance . It creates a current due to the presence of a uniform magnetic field
that is directed into the figure (marked with ×'s). The bar has mass
, length
, and initial velocity
(blue) toward the right. After release at
, position and velocity as a function of time are shown. Note that the induced current is counterclockwise and the magnetic force
(orange) points in the direction opposite to the motion.
Contributed by: Enrique Zeleny (October 2011)
Open content licensed under CC BY-NC-SA
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"Magnetic Force on a Sliding Bar"
http://demonstrations.wolfram.com/MagneticForceOnASlidingBar/
Wolfram Demonstrations Project
Published: October 9 2011