Parallel Capacitors: C1+C2 or C1-C2?

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SUMMARY

The equivalent capacitance for two capacitors in parallel is calculated using the formula Ceq = C1 + C2. In the discussed scenario, where the positive plate of one capacitor is connected to the negative plate of another, the configuration does not change the fundamental rule of parallel capacitance. The effective capacitance remains C1 + C2, as the connection method does not alter the total capacitance in parallel arrangements.

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I know that the equivalent capacitance for two capacitors in parallel is C1+C2=Ceq. But consider I charge 2 plate capacitors so that each capacitor has a positive and negative plate and then I connect the positive plate of one cap. to the negative plate of the other capacitor in a parallel connection. My question is should the equivalent capacitance be c1+c2 OR c1-c2?
 
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c1 + c2

It's like adding two containers of volumes v1 and v2. The net size of the resulting container does not depend upon the contents.
 

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