Two parallel plates of a capacitor have equal and opposite charges
Answers
A parallel plate capacitor consists of two plates with an insulating dielectric between them (air, oiled paper, mica, etc). Imagine connecting a parallel plate capacitor to a voltage source and closing a switch. Electrons want to move from positive pole of the voltage source to the negative pole. One side of the capacitor is going to be connected to the positive source, and the other negative. Electrons will begin to accumulate on the plate connected to the positive source. As they do so, the place accumulates a charge. This charge repels electrons in the opposite plate, and those electrons move away from the plate, giving it the opposite charge. This separation of charges creates an electric field across the two plates. In a DC circuit where the voltage is the same, the plate in the capacitor will accumulate charge until the voltage across the capacitor is the same as the voltage across the power supply (open circuit conditions). In an AC circuit, the constant push-pull of rising and falling voltages mean the two plates are constantly changing in charge as they rise and fall in response to the ambient voltage of the system.
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