---
title: "An uncharged, isolated metallic rod is supported by an insulating stand. A positively charged sphere carrying charge \\(+Q\\) is brought near the left end of the rod without touching it, causing charge separation within the rod. While the positively charged sphere remains in place, a conducting wire briefly connects the right end of the rod to the ground and is then removed. Finally, the positively charged sphere is moved far away. Which of the following statements correctly describes the net charge on the rod after the sphere is removed and provides the correct physical explanation?"
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url: "https://nerd-notes.com/ubq/117002/"
date_modified: "2026-08-04T06:16:58+00:00"
---

# An uncharged, isolated metallic rod is supported by an insulating stand. A positively charged sphere carrying charge \(+Q\) is brought near the left end of the rod without touching it, causing charge separation within the rod. While the positively charged sphere remains in place, a conducting wire briefly connects the right end of the rod to the ground and is then removed. Finally, the positively charged sphere is moved far away. Which of the following statements correctly describes the net charge on the rod after the sphere is removed and provides the correct physical explanation?

An uncharged, isolated metallic rod is supported by an insulating stand. A positively charged sphere carrying charge \(+Q\) is brought near the left end of the rod without touching it, causing charge separation within the rod. While the positively charged sphere remains in place, a conducting wire briefly connects the right end of the rod to the ground and is then removed. Finally, the positively charged sphere is moved far away. Which of the following statements correctly describes the net charge on the rod after the sphere is removed and provides the correct physical explanation?

![A positively charged sphere labeled +Q is positioned to the left of a horizontal, cylindrical metallic rod supported on a vertical insulating stand. The left side of the rod is near the sphere, and the right side of the rod has a wire extending downward toward a three-line ground symbol.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785824218-Y65o80.jpg)

- **A.** The rod has a net negative charge because free electrons flow from the ground onto the rod.
- **B.** The rod has a net positive charge because free electrons flow from the rod into the ground.
- **C.** The rod has a net negative charge because positive protons flow from the rod into the ground.
- **D.** The rod remains neutral because equal amounts of positive and negative charge flow through the wire in opposite directions.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/117002/*