---
title: "Two point charges are fixed on the \\(x\\)-axis: a charge \\(+Q\\) is located at \\(x = 0\\) and a charge \\(-4Q\\) is located at \\(x = d\\), where \\(d > 0\\). Which of the following correctly identifies the position on the \\(x\\)-axis where the net electric field is zero, and the direction of the net electric field at \\(x = 2d\\)?"
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url: "https://nerd-notes.com/ubq/117962/"
date_modified: "2026-08-04T08:02:43+00:00"
---

# Two point charges are fixed on the \(x\)-axis: a charge \(+Q\) is located at \(x = 0\) and a charge \(-4Q\) is located at \(x = d\), where \(d > 0\). Which of the following correctly identifies the position on the \(x\)-axis where the net electric field is zero, and the direction of the net electric field at \(x = 2d\)?

Two point charges are fixed on the \(x\)-axis: a charge \(+Q\) is located at \(x = 0\) and a charge \(-4Q\) is located at \(x = d\), where \(d > 0\). Which of the following correctly identifies the position on the \(x\)-axis where the net electric field is zero, and the direction of the net electric field at \(x = 2d\)?

![A horizontal x-axis line with an origin tick mark labeled x = 0 and another tick mark labeled x = d to the right. At x = 0, a small filled circle is labeled +Q. At x = d, a larger filled circle is labeled -4Q. An arrow points to the right at the right end of the axis, labeled +x. A dashed horizontal line extends along the x-axis through both charges. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785830562-VCLN9j.jpg)

- **A.** Position: \(x = -\dfrac{d}{3}\) | Direction: \(+x\)-direction
- **B.** Position: \(x = -d\) | Direction: \(+x\)-direction
- **C.** Position: \(x = -d\) | Direction: \(-x\)-direction
- **D.** Position: \(x = 3d\) | Direction: \(-x\)-direction

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/117962/*