Prove that from this experience the conclusion follows: as the distance between the plates decreases, the capacitance

Prove that from this experience the conclusion follows: as the distance between the plates decreases, the capacitance of the capacitor increases.

The capacitance of a capacitor is determined by the expression:
C = q / U
Because the charge on the plates does not change, and the voltage decreases as the distance between the plates decreases, then the electrical capacity will increase.

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