What happens if I have a permanent magnet outside an ideal solenoid? Does the permanent magnet rotate until the system reaches an energy minimum in its magnetic fields? Or does the permanent magnet fail to rotate because the magnetic field of the solenoid does not reach the magnet? Wouldn't there be a magnetic force on the solenoid due to the permanent magnet even though the magnetic field of the solenoid does not reach the permanent magnet? The more general question is this, "Does non-uniformity of magnetic fields external to a permanent magnet affect the force on the permanent magnet?" Sincerely, Kevin M.