Electrostatic charge distribution questions

In summary: Yes, the sphere is conducting... sorry... so how can that be? The charge on the inner surface of the shell exactly cancels the electric field from whatever non-uniform charge distribution is inside the shell.
  • #1
PhDorBust
143
0
If charge distribution inside sphere is non-uniform, how is distribution on outside of sphere uniform? (Think spherical shell with point charge anywhere inside)

And how can a non-uniform surface charge be still equipotential. If there was a strong enough induced charge, wouldn't the behavior become as if it were a dipole?
 
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  • #2
If the charge distribution inside a sphere is non-uniform, then the distribution outside the sphere would be non-uniform. Unless the sphere is conducting. I don't understand your second question, can you clarify it?
 
  • #3
kanato said:
If the charge distribution inside a sphere is non-uniform, then the distribution outside the sphere would be non-uniform. Unless the sphere is conducting. I don't understand your second question, can you clarify it?

Yes, the sphere is conducting... sorry... so how can that be?

My second question relates to how a nonuniform surface charge can still be equipotential on the surface. If there were a very strong induced charge, the surface charge would become as if it were a dipole, right? And the potential on the surface of a dipole like that would vary because the electric field is not exactly the same in each direction.
 
  • #4
In electrostatics, a conductor is always an equipotential surface. If the conductor had different parts at different potentials, then the charges in it would move from areas of high potential to areas of lower potential until the potential is equalized everywhere in the conductor.

If you consider the sphere alone, then yes it would be like a dipole. But remember that the charge distribution in a conductor is a response to the charge distribution elsewhere, so when you look at the whole situation the conductor will be an equipotential surface. This is true even if there is a non-uniform surface charge distribution on the conductor; even though the electric field at the surface will vary the conductor will still be at a constant potential.
 
  • #5
kanato said:
If the charge distribution inside a sphere is non-uniform, then the distribution outside the sphere would be non-uniform. Unless the sphere is conducting. I don't understand your second question, can you clarify it?

Thank you for answer... but in the first question the sphere is conducting so how can conducting spherical shell have a non-uniform inner charge yet uniform outer charge?
 
  • #6
The inner charge and the outer charge don't "see" each other. The charge on the inner surface of the shell exactly cancels the electric field from whatever non-uniform charge distribution is inside the shell. The charge on the inner surface arranges itself to equalize the potential on that surface so that there is no electric field inside the conductor. If that does not require equal amounts of positive and negative charge, then the the "balancing" charge that makes the sphere neutral will go to the other surface, and those charges will only see the other charges on the same surface, so they will distribute themselves evenly over the outer surface. Remember, in electrostatics there is no electric field inside a conductor, so there is no way for charges to see each other through a conductor.
 

1. What is electrostatic charge distribution?

Electrostatic charge distribution is the arrangement of electric charges in a given space. This can be caused by the presence of charged particles or objects, and is influenced by factors such as distance and the properties of the material.

2. How is electrostatic charge distributed?

Electrostatic charge is distributed through the movement of charged particles, such as electrons, from one location to another. This can occur through various processes such as friction, induction, or conduction. The distribution of charge depends on the properties of the objects involved and the environment in which they are located.

3. What is the importance of understanding electrostatic charge distribution?

Understanding electrostatic charge distribution is important in many fields, including physics, chemistry, and engineering. It allows us to explain and predict the behavior of electrically charged objects and systems, and is crucial in the design and function of electronic devices.

4. How does electrostatic charge distribution affect everyday life?

Electrostatic charge distribution plays a role in many aspects of our daily lives. For example, it is responsible for the attraction and repulsion between objects, the functioning of electronic devices, and even the formation of lightning during a storm. It also has practical applications in industries such as printing, painting, and electrostatic precipitation.

5. Can electrostatic charge distribution be controlled?

Yes, electrostatic charge distribution can be controlled through various methods such as grounding, shielding, and neutralization. These techniques are used to manage the buildup and transfer of charge in order to prevent damage to sensitive equipment or to achieve a desired outcome, such as in industrial processes.

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