Refer to the diagram. Both capacitors are fully charged. Find the potential of the conducting surface indicated in the diagram (which is the conducting surface between the two capacitors, the bottom of the top capacitor and the top of the bottom capacitor). It is not okay to use some formula you memorized for two capacitors in series, but here is a hint: think about what the net charge would have to be on that conducting surface between the two capacitors.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.