Charge over an Insulating Plate

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Homework Help Overview

The problem involves a uniformly charged insulating plate with a specified charge density and a tiny charged bob connected by an insulating string. The scenario includes the mass of the bob and the angle of the string relative to the plate, leading to a question about the charge on the bob.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants express uncertainty about how to begin solving the problem and seek guidance on the setup, including the attachment point of the string. Questions arise regarding the electric field near the plate and its relevance to the forces acting on the bob.

Discussion Status

The discussion is ongoing, with participants attempting to clarify the problem setup and explore the implications of the electric field. Some guidance has been offered regarding the electric field, but no consensus or clear direction has emerged yet.

Contextual Notes

Participants have noted the need for a diagram to better understand the problem, indicating that visual context may be crucial for interpreting the forces involved.

AJDangles
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Homework Statement



Charge is distributed uniformly over the surface of a very large thin
insulating plate to a density of 5.00 x 10–6 C/m2 . An insulating string
connects a tiny charged bob to the vertical plate as shown in the
diagram. If the mass of the object is .001 g and the string makes an
angle of 30o to the plate, how much charge is carried by the bob?

Homework Equations



I have no clue.

The Attempt at a Solution



No idea where I should start. Can someone point me in the right direction?
 
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AJDangles said:

Homework Statement



Charge is distributed uniformly over the surface of a very large thin
insulating plate to a density of 5.00 x 10–6 C/m2 . An insulating string
connects a tiny charged bob to the vertical plate as shown in the
diagram. If the mass of the object is .001 g and the string makes an
angle of 30o to the plate, how much charge is carried by the bob?

Homework Equations



I have no clue.

The Attempt at a Solution



No idea where I should start. Can someone point me in the right direction?
First explain where the string is attached to the plate.

Better yet, post an image of the diagram.
 
Diagram here:
 

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What is the Electric field near the surface of the plate?
 
SammyS said:
What is the Electric field near the surface of the plate?

Take the force of gravity times a component of the angle, multiply by the charge of a proton?
 

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