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- Magnetising the next generation of high-throughput satellites
- The current flowing through the inductor has some "inertia" and does not stop as soon as the source is removed. To compensate the decreasing current, the the polarity is reversed. Similar to a train that is suddenly derailed and all the electron carriages stack on top of each other at the end, increasing the negative charge until the current stops. It's also the principle behind spark plugs.