Very informative - I just miss the information on what happens when you switch off your inductor coil - the metal somehow needs to get back into its default state. I wonder if the metal itself is somewhat spring-like, or whether a simple spring is used to push it back into its default position?
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Most of the ones I've seen contained a discrete spring that connects to the opposite side of moving metal bar and pulls it back to the default position when the magnetic force is removed.