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  1. SongDog

    Are charged batteries heavier?

    @CWatters, you might want to re-read that Wikipedia entry more closely.
  2. SongDog

    Why doesn't a magnetically levitating conductor oscillate?

    In the DC limit, Lenz' law tells us that the EMF goes to zero. At nonzero frequencies the induced EMF is proportional to (and opposing) the rate of flux change, so lower frequencies would require higher currents to maintain the same peak lifting force. However, with ordinary...