Ow does potential decreases when there there is force

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When a positive charge and a negative charge are attracted to each other, their potential energy decreases as they move closer, converting energy into kinetic energy. If discussing voltage, the system behaves like a capacitor, where the voltage decreases as the charges come closer due to a reduction in capacitance. Conversely, if the charges start close together, work must be done to separate them, resulting in an increase in potential difference. The relationship between charge, voltage, and capacitance is crucial in understanding these dynamics. Overall, the potential changes based on the relative positions and movements of the charges involved.
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how does potential decreases when there there is force of attraction between a positive charge and a negative charge
 
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Do you mean potential energy ? It will decrease if they move together by an increase of kinetic energy.
If you mean voltage then think of the pair as a capacitor where C=Q/V or rewritten
V=Q/C as the charges are allowed ( under control) to get closer the capacity gets smaller so the voltage decreases.
Alternatively if you start with the charges very close you are going to do work to separate them -- the definition of potential difference is work done per unit charge so the potential increases on separation.
 
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