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Ludwik asked: . . .
But Faynman argues that two ways of
changing the flux result in two different phenomena.
Right or wrong? I wish I could refer to an experimental
verification of this theoretical claim.
It may help to compare the cyclotron vs. the betatron:
The cyclotron employs only the qVxB effect to force an injected charged
particle into a circular "current". The B field is static in time. The
orbit is governed by |qVxB| = mV^2/R . There are no conductors to
constrain the motion, so that no static charges accumulate. The magnetic
field does no work - the energy of the "current" is still what it had at
injection.