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New Capacitance in Dielectric

What happens ...

Question

What happens when 2 capacitors are connected with:opposite polarity plates connected together and same polarity plates are connected together

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Solution

Case1: When capacitors' opposite polarity plates are connected together:

Total charge, $Q_{1} - Q_{2}$ , here charge will be subtracted.
So, common potential will be, $\frac{Q_{1} - Q_{2}}{C_{1} + C_{2}}$
Case2: When capacitors' same polarity plates are connected together:

Total charge, $Q_{1} + Q_{2}$
So, common potential will be, $\frac{Q_{1} + Q_{2}}{C_{1} + C_{2}}$

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