The curious case of Magnetron's surface charges!

We all are familiar with microwave ovens. The component inside this machine that’s responsible for producing microwaves is known as a magnetron. When high voltage is applied to the cathode of a magnetron, it ejects many electrons through thermionic emission. When the electron comes towards the anode, it repels the nearest cavity’s electrons. Due to this electron displacement, positive charges form on that surface. The displaced electrons will obviously make a surface of negative charges on the nearby cavity. Now something peculiar happens; the same charge pattern is automatically induced in all the cavities. Do you know how charges induced in just one cavity lead to induction of charges in the other cavities? Let's explore the answer in this video.

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