Answer: kq 1 q 2 /r.
- A kq<sub>1</sub>q<sub>2</sub>/r<sup>2</sup>
- B kq<sub>1</sub>q<sub>2</sub>/r
- C kq<sub>1</sub>q<sub>2</sub> x r
- D k(q<sub>1</sub>+q<sub>2</sub>)/r
Correct answer: B. kq<sub>1</sub>q<sub>2</sub>/r
Explanation: Electric potential energy U = kq<sub>1</sub>q<sub>2</sub>/r. This is the work done to assemble the charges from infinity.
Field lines (radial) and equipotential lines (concentric circles) of a point charge. Equipotential surfaces are always perpendicular to the field lines. Image: Sjlegg, Public Domain, via Wikimedia Commons.
Concept context
Electric potential, equipotential surfaces, potential energy of charge systems, conductors, dielectrics, capacitors, combinations, and energy storage.
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