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title: "Two identical, isolated conducting spheres, \\(A\\) and \\(B\\), initially carry net charges of \\(+5Q\\) and \\(-1Q\\), respectively. The spheres are brought into contact, allowed to reach electrostatic equilibrium, and then separated. Which of the following correctly identifies the final charge on sphere \\(A\\) and the physical condition that causes charge transfer between the spheres to cease?"
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url: "https://nerd-notes.com/ubq/117917/"
date_modified: "2026-08-04T08:02:34+00:00"
---

# Two identical, isolated conducting spheres, \(A\) and \(B\), initially carry net charges of \(+5Q\) and \(-1Q\), respectively. The spheres are brought into contact, allowed to reach electrostatic equilibrium, and then separated. Which of the following correctly identifies the final charge on sphere \(A\) and the physical condition that causes charge transfer between the spheres to cease?

Two identical, isolated conducting spheres, \(A\) and \(B\), initially carry net charges of \(+5Q\) and \(-1Q\), respectively. The spheres are brought into contact, allowed to reach electrostatic equilibrium, and then separated. Which of the following correctly identifies the final charge on sphere \(A\) and the physical condition that causes charge transfer between the spheres to cease?

![Two identical metallic spheres labeled A and B are drawn side by side with a small gap between them. Sphere A on the left is labeled +5Q. Sphere B on the right is labeled -1Q. Both spheres have the same radius R and are mounted on thin insulating stands. No other labels, lines, text, or axes appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1785830554-nbJ6l9.jpg)

- **A.** Final charge: \(+3Q\) ; Condition: The net charge of the two-sphere system becomes zero
- **B.** Final charge: \(+3Q\) ; Condition: The spheres reach the same electric potential
- **C.** Final charge: \(+2Q\) ; Condition: The spheres reach the same electric potential
- **D.** Final charge: \(+2Q\) ; Condition: The net charge of the two-sphere system becomes zero

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/117917/*