Answer: E = -dV/dr.
- A E = V/r
- B E = -dV/dr
- C E = dV/dr
- D E = V x r
Correct answer: B. E = -dV/dr
Explanation: E = -dV/dr. The electric field is the negative gradient of the potential. Field points from high to low 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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