Oh, there is a small issue with the Ejs applet at the top post. The slider magnet position xm = _______
on drag without release but still holding on to the slider but not moving, the deflection should be zero. the current codes shows a bug still shows the deflection due to the earlier motion even though motion v = 0.
do you notice it too? ;D
i try to fix the bug sometime beginning of this year before was not successful.

to check the issue, we can also check this applet by Phet, a good example of Faraday's law of induction TAB choose PickUpCoil
http://phet.colorado.edu/en/simulation/faraday [img]http://phet.colorado.edu/sims/faraday/faraday-screenshot.png[/img]