---
title: "Two large, parallel planar equipotential surfaces with electric potentials of 100 V and 150 V are oriented vertically, as shown. An electron is placed at rest in the uniform field region between the two surfaces. Which of the following best describes the direction of the electrostatic force exerted on the electron?"
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url: "https://nerd-notes.com/ubq/121051/"
date_modified: "2026-08-23T04:57:37+00:00"
---

# Two large, parallel planar equipotential surfaces with electric potentials of 100 V and 150 V are oriented vertically, as shown. An electron is placed at rest in the uniform field region between the two surfaces. Which of the following best describes the direction of the electrostatic force exerted on the electron?

Two large, parallel planar equipotential surfaces with electric potentials of 100 V and 150 V are oriented vertically, as shown. An electron is placed at rest in the uniform field region between the two surfaces. Which of the following best describes the direction of the electrostatic force exerted on the electron?

![Two vertical parallel dashed lines separated horizontally across a white background. The left vertical dashed line is labeled 100 V at its top end. The right vertical dashed line is labeled 150 V at its top end. Centered in the horizontal space between the two dashed lines is a small solid black circle labeled e^-. In the lower-left corner of the diagram, a set of Cartesian coordinate axes shows a horizontal arrow labeled +x pointing to the right and a vertical arrow labeled +y pointing upward. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787461057-5aRKsh.jpg)

- **A.** Directed parallel to the surfaces, in the \(+y\)-direction
- **B.** Directed parallel to the surfaces, in the \(-y\)-direction
- **C.** Directed perpendicular to the surfaces, toward the \(100\text{ V}\) surface (in the \(-x\)-direction)
- **D.** Directed perpendicular to the surfaces, toward the \(150\text{ V}\) surface (in the \(+x\)-direction)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/121051/*