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potential difference
can be simply defined as the difference of electrical potential between two points.
repel
When two positive charges when brought close to each other, they what?
attract
when a positive and a negative charge are brought close together, they what?
volt
The unit of potential difference (pd)
Potential difference (through work done and electrical charge).
The potential difference of a certain charge is directly proportional to the work done by the electrical circuit and inversely proportional to the electrical charge.
Note 
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