Worksheet: Defining Equipotential Surfaces

In this worksheet, we will practice calculating the distance between points in an electric field that have the same value of absolute electric potential.


In a region containing an electric field, equipotential surfaces have the potentials of 𝑉=100 V for 𝑧=0.00 m, 𝑉=200 V for 𝑧=0.50 m, and 𝑉=300 V for 𝑧=1.00 m. What is the electric field in this region?

  • Aο€Ή0𝐸,0𝐸,300πΈο…ο—ο˜ο™ V/m
  • Bο€Ή200𝐸,200𝐸,200πΈο…ο—ο˜ο™ V/m
  • Cο€Ή100𝐸,0𝐸,400πΈο…ο—ο˜ο™ V/m
  • Dο€Ή0𝐸,0𝐸,200πΈο…ο—ο˜ο™ V/m
  • Eο€Ή0𝐸,100𝐸,100πΈο…ο—ο˜ο™ V/m


A very large sheet of insulating material has had an excess of electrons placed on it to a surface charge density of βˆ’3.00 nC/m2.

What is the spacing between equipotential surfaces that differ in potential by 1.00 V?


A pair of parallel plates have a uniform charge density of 2.0Γ—10 C/m2. What is the distance between equipotential surfaces parallel to the plates for which the potential differences from each other equal 25 V?

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