---
title: "Two identical, isolated conducting spheres, A and B, carry initial charges of \\(+4Q\\) and \\(-2Q\\), respectively. The spheres are brought into brief physical contact and then separated. Which of the following correctly gives the final charge on each sphere and the direction of net electron transfer while they were in contact?  | Choice | Final Charge on Each Sphere | Direction of Net Electron Transfer | |—|—|—| | A | \\(+2Q\\) | From Sphere B to Sphere A | | B | \\(+Q\\) | From Sphere B to Sphere A | | C | \\(+Q\\) | From Sphere A to Sphere B | | D | \\(+2Q\\) | From Sphere A to Sphere B |"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/118185/"
date_modified: "2026-08-04T08:07:57+00:00"
---

# Two identical, isolated conducting spheres, A and B, carry initial charges of \(+4Q\) and \(-2Q\), respectively. The spheres are brought into brief physical contact and then separated. Which of the following correctly gives the final charge on each sphere and the direction of net electron transfer while they were in contact?

| Choice | Final Charge on Each Sphere | Direction of Net Electron Transfer |
|—|—|—|
| A | \(+2Q\) | From Sphere B to Sphere A |
| B | \(+Q\) | From Sphere B to Sphere A |
| C | \(+Q\) | From Sphere A to Sphere B |
| D | \(+2Q\) | From Sphere A to Sphere B |

Two identical, isolated conducting spheres, A and B, carry initial charges of \(+4Q\) and \(-2Q\), respectively. The spheres are brought into brief physical contact and then separated. Which of the following correctly gives the final charge on each sphere and the direction of net electron transfer while they were in contact?

| Choice | Final Charge on Each Sphere | Direction of Net Electron Transfer |
|---|---|---|
| A | \(+2Q\) | From Sphere B to Sphere A |
| B | \(+Q\) | From Sphere B to Sphere A |
| C | \(+Q\) | From Sphere A to Sphere B |
| D | \(+2Q\) | From Sphere A to Sphere B |

![A schematic diagram showing two isolated, identical conducting spheres labeled A and B suspended horizontally. Sphere A on the left is labeled +4Q with radius R. Sphere B on the right is labeled -2Q with the same radius R. The spheres are shown separated by a short distance before contact. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785830876-TsJqQC.jpg)

- **A.** Final Charge: \(+2Q\) | Electron Transfer: From Sphere B to Sphere A
- **B.** Final Charge: \(+Q\) | Electron Transfer: From Sphere B to Sphere A
- **C.** Final Charge: \(+Q\) | Electron Transfer: From Sphere A to Sphere B
- **D.** Final Charge: \(+2Q\) | Electron Transfer: From Sphere A to Sphere B

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/118185/*