Answer: doubles.
- A halves
- B doubles
- C becomes four times
- D is unchanged
Correct answer: B. doubles
Explanation: Q is fixed; C halves, so U = Q²/2C doubles.
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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