Answer: Zero.
- A kQ/d
- B 2kQ/d
- C Zero
- D kQ/d<sup>2</sup>
Correct answer: C. Zero
Explanation: V<sub>midpoint</sub> = kQ/d + k(-Q)/d = 0. Potential is zero at midpoint between equal and opposite charges.
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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