Question

Three identical large metallic plates are placed parallel to each other at a very small separation as shown in. The central plate is give a charge Q. What amount of charge will flow to earth when the key is pressid?
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Answer 1

On connecting with earth, the charge on central plate will shift ot its right face. `-Q` charge will be induced on the induced on the left face of the earthed plate. Thus, `+Q` charge will flow to the earth.
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