Magnetic field moving faster than speed of light???? We know the equations for speed of rotating magnetic field, as N= 120*f/P, where f is frequency of AC currents & P is number of magnetic poles. Say by some method we are able to produce a very high frequency AC voltage & apply that to a stator of 3 phase induction motor's stator, such that the peripheral speed(v) of magnetic field (v=r*w; where r is radius of rotating magnetic field & w is angular speed (rad/sec) = 2*pi* N/60), exceeds 'c', the old speed of light. But according to special Relativity as we know this would not be possible. So what phenomenon would occur at that time? Does the radius of motor goes on decreasing as we increase the frequency???