---
title: "A student performs two separate charging experiments using identical, initially uncharged electroscopes and identical negatively charged rods. In Experiment 1, the negatively charged rod touches the knob of Electroscope 1 and is then removed. In Experiment 2, the negatively charged rod is brought near the knob of Electroscope 2 without touching, the electroscope is briefly connected to a ground, the ground wire is disconnected, and then the rod is moved far away. Which choice correctly gives the sign of the final net charge remaining on Electroscope 1 and Electroscope 2?"
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url: "https://nerd-notes.com/ubq/117882/"
date_modified: "2026-08-04T08:02:21+00:00"
---

# A student performs two separate charging experiments using identical, initially uncharged electroscopes and identical negatively charged rods. In Experiment 1, the negatively charged rod touches the knob of Electroscope 1 and is then removed. In Experiment 2, the negatively charged rod is brought near the knob of Electroscope 2 without touching, the electroscope is briefly connected to a ground, the ground wire is disconnected, and then the rod is moved far away. Which choice correctly gives the sign of the final net charge remaining on Electroscope 1 and Electroscope 2?

A student performs two separate charging experiments using identical, initially uncharged electroscopes and identical negatively charged rods. In Experiment 1, the negatively charged rod touches the knob of Electroscope 1 and is then removed. In Experiment 2, the negatively charged rod is brought near the knob of Electroscope 2 without touching, the electroscope is briefly connected to a ground, the ground wire is disconnected, and then the rod is moved far away. Which choice correctly gives the sign of the final net charge remaining on Electroscope 1 and Electroscope 2?

![Two electroscopes are drawn side by side, labeled Experiment 1 on the left and Experiment 2 on the right. Each electroscope consists of a top circular metal knob, a vertical metal stem extending down into a glass jar, and two flexible metal leaves at the bottom. In Experiment 1, a rectangular rod labeled with minus signs rests in direct contact with the top knob of Electroscope 1. In Experiment 2, an identical rectangular rod labeled with minus signs is held above the top knob of Electroscope 2 without touching, and a thin wire connects the knob of Electroscope 2 to a standard three-bar ground symbol. No other labels, text, or arrows appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785830541-9fiwhD.jpg)

- **A.** Electroscope 1: Positive | Electroscope 2: Negative
- **B.** Electroscope 1: Positive | Electroscope 2: Positive
- **C.** Electroscope 1: Negative | Electroscope 2: Negative
- **D.** Electroscope 1: Negative | Electroscope 2: Positive

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/117882/*