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Charge distribution on plates

$A,B,C$ are $3$ identical metallic plates. Initially, charges $Q$, $4Q$ and $2Q$ were given to $A$,$B$ and $C$ respectively. Find final charge distributions when $B$ was earthed and $A$ and $C$ were ...
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Franck and Hertz graph function

I need a function whom graph is the following (the Frank and Hertz experiment graph): Currently I wrote the following function: ...