Question about charged particle in an electric field

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Homework Help Overview

The discussion revolves around a problem involving a charged particle in an electric field, specifically a small charged sphere attached to a thread. The first part of the question asks for the magnitude and direction of the electric field when the sphere is in a static position. The second part explores the conditions under which the particle could be suspended above a charged plate.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss the forces acting on the sphere, including gravitational force and tension in the thread. There are questions about the direction of these forces and the electric force, as well as how to determine the magnitude of the electric field.

Discussion Status

Some participants have suggested drawing diagrams to visualize the forces involved. There is ongoing exploration of the relationships between the forces and the directions they act in, with no explicit consensus reached yet.

Contextual Notes

Participants express uncertainty about interpreting the questions and the necessary steps to approach the problems. There is mention of needing to quote relevant equations and provide attempts at solutions, indicating a structured approach to the homework task.

Matthew Muro
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Member advised to use the formatting template for all homework help requests
Question:
A) A small charged sphere is attached to a thread and placed in an electric field. The other end of the thread is anchored so that the sphere is in a static situation when placed in the field. If the thread is horizontal, find the magnitude and direction of the electric field. The sphere has a mass of 0.05 kg and contains a charge of +3e3 C. Show your work and/or explain your reasoning.

B) Now the same particle is removed from the thread and placed over the center of a charged plate. Are there any conditions under which it is possible for the particle to be suspended in the air above the plate?

Hello all, my problem is picturing and interpreting what each question is exactly asking for and what to do in order to solve these problems. I am not sure what these problems are asking for. Thank you in advance to all of those who help!
 
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Have you tried to draw a diagram for the first question? What forces act on the sphere, and in what directions?
 
haruspex said:
Have you tried to draw a diagram for the first question? What forces act on the sphere, and in what directions?
Well from my understanding, the only definitive forces acting upon the sphere are Fg and tension of the string but I am confused in what direction the tension is supposed to be in as well as what direction the Fe (electric force) is supposed to point in (which I am assuming indicated the direction of the electric field)
 
Matthew Muro said:
what direction the tension is supposed to be in
You are told it is horizontal.
Matthew Muro said:
what direction the Fe (electric force) is supposed to point in
That is what you are asked to determine.
 
haruspex said:
You are told it is horizontal.

That is what you are asked to determine.
So the tension would be either to the left or right (does not matter I am assuming). The electric field would be placed in a manner that would allow the electric force to point either up or down but i am not sure how to determine which direction. I am also not too sure how to determine the magnitude.
 
Matthew Muro said:
So the tension would be either to the left or right (does not matter I am assuming). The electric field would be placed in a manner that would allow the electric force to point either up or down but i am not sure how to determine which direction. I am also not too sure how to determine the magnitude.
Initially you wrote that you did not understand what the question was asking for, so I did not insist on your completing the template (which you should not have deleted).
Now we are past that. Please quote any standard equations you believe may be relevant and show some attempt. Posting a free body diagram would be a good start.
 

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