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Capacitors are devices that accumulate voltage in separated electric charges, but their mechanism and mathematics can describe thermal insulation and the discharge of lightning from cloud to ground.

A transformer has 40 turns in its primary coil and 20 turns in its secondary coil. Is it a step-up transformer or a step-down transformer?

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**in microjoules**) is required to pull apart the plates such that the distance \(d \) between them is doubled?

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Each capacitor in the above diagram has capacitance \(C\). What is the equivalent capacitance?

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