**Electric Potential Energy – University Physics Volume 2**
https://opentextbc.ca/universityphysicsv2openstax/chapter/electric-potential-energy/

where we have defined positive to be pointing away from the origin and r is the distance from the origin. The directions of both the displacement and the applied force in the system in are parallel, and thus the work done on the system is positive.. We use the letter U to denote electric potential energy, which has units of joules (J). When a conservative force does negative work, the system ...

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