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Why do capacitors block DC and pass AC?

If a constant voltage is applied across a capacitor that is not charged, it will charge up to a certain value. Capacitors are said to block DC. The capacitor tries to keep the voltage constant if it changes over time.If a constant voltage (DC) is applied to a capacitor that is not charged, it is charged up to a value determined by voltage and capacity (QCV). That's why it is said that capacitors block DC. If the voltage always changes over time (AC), the capacitor tries to keep it constant.

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