I set up an experiment where I drove a solenoid with an H-bridge circuit at one voltage, and then I repeated the experiment with a higher voltage. There was a magnet positioned above the solenoid such that it was free to oscillate side to side (see picture). My observation was this: with the same driving frequency, the same duty cycle, and same overall setup, it appeared as if the magnet was oscillating faster when the higher voltage was applied. Can someone help me to understand what I may have been seeing? My understanding of the physics of this situation led me to believe that I should have see it rotate at the same frequency as I was driving the coil regardless of the voltage applied, but it should have moved farther with each oscillation. Did I just imagine that I was seeing it move more quickly? What is voltage's effect on the rotation of a magnet in a solenoid?