Answer: Constant and equal to the surface value.
- A Zero, since field is zero inside
- B Constant and equal to the surface value
- C Greatest at the centre point
- D Different at every interior point
Correct answer: B. Constant and equal to the surface value
Explanation: The field inside is zero, so no work is done moving a charge inside. The potential is therefore constant everywhere inside and equals the value on the surface.
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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