The two fields combine to produce a force on the metal it interacts with. This is often referred to as a shaded pole, and the same technique can help AC motors self-start as well as hold in relays ...

The two fields combine to produce a force on the metal it interacts with. This is often referred to as a shaded pole, and the same technique can help AC motors self-start as well as hold in relays ...

likely a very thin one around such a small object? to increase the pressure and drive winds toward the shaded pole. Nitrogenice turns into a gas at cooler temperatures and so there would be more ...