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Why does the metal mesh cover also have the effect of electrostatic shielding?

The basic concept of electrostatic shielding is as follows: Assuming that there is a charge Q on the outside of a cavity conductor (discussing the closed conductor first), there will be an induced charge on the outer surface of the cavity conductor due to electrostatic induction induction. The electric field caused by the induced charge inside the cavity and the electric field caused by Q inside the cavity cancel each other out, thereby promoting the electric field inside the cavity to have zero tensile strength. Let's discuss the metal mesh cover again. Although the sealing cover has the hollow part you often say, it does not harm the induced charge on the metal mesh cover. The electric field outside the metal mesh cover will also be offset by the electric field of the induced charge.

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