Answer: zero.
- A zero
- B a maximum
- C negative
- D infinite
Correct answer: A. zero
Explanation: No work is needed to move a charge between points at the same potential.
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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