Solve Image Charge Problem: No Quotes

In summary, the conversation discusses the potential of a cylinder relative to a plane, using Gauss's theorem and the method of images. There is a question about the symmetry used in Gauss's theorem and what the variable ##\Phi## represents. It is also mentioned that dragging the cylinder to infinity would require work, which could be divided by the charge to answer the exercise. The presence of the cylinder induces a charge distribution in the plane, affecting the potential at the cylinder. However, there is some confusion in the attached working, where it appears a z+d value was changed to z-d.
  • #1
BREAD
50
0

Homework Statement


asdasd.PNG


Homework Equations

The Attempt at a Solution



I don't understand what is the meaning of "potential of cylinder relative to the plane"
I think the potential of cylinder is just -q/2πε ln r by Gauss's theorem[/B]
KakaoTalk_20170320_215526648.jpg
 
Physics news on Phys.org
  • #2
What symmetry is there that you use in the Gauss theorem ? Does that apply here ?
What does the ##\Phi## you write down represent ?

It will require a certain amount of work to drag the cylinder to infinity. Isn't that work, divided by the charge, the answer the exercise ants from you ?
 
  • #3
BREAD said:
the potential of cylinder is just -q/2πε ln r by Gauss's theorem
The cylinder will induce a charge distribution in the plane. That in turn will affect the potential at the cylinder.
You attach some working but don't explain it. The method of images is certainly the right way, but it looks like a z+d got changed to a z-d at the second line.
 

Related to Solve Image Charge Problem: No Quotes

1. What is an image charge problem?

An image charge problem is a type of electrostatics problem where the presence of a conductive surface or boundary affects the electric field and potential in the surrounding space. The "image charge" refers to a hypothetical charge that is created at a mirrored position on the opposite side of the boundary, and is used to simplify the problem and find a solution.

2. Why are image charge problems important?

Image charge problems are important in understanding and analyzing the behavior of electric fields and potentials in complex systems, particularly in situations involving conductors and insulators. They are also applicable in practical applications such as designing electronic devices and analyzing the behavior of charged particles in a vacuum.

3. How do you solve an image charge problem?

To solve an image charge problem, you first need to identify the boundary and the charges present in the system. Then, using the method of images, you create a mirrored charge on the opposite side of the boundary and use the principle of superposition to find the total electric field and potential. This can be done analytically or numerically using computational methods.

4. What are some common mistakes when solving image charge problems?

One common mistake is forgetting to account for the image charge when calculating the total electric field or potential. Another mistake is using the wrong boundary conditions or not properly considering the symmetry of the system. It is also important to be careful with the signs and values of the charges used in the problem.

5. Are there any limitations to using the method of images to solve image charge problems?

Yes, there are some limitations to using the method of images. It is only applicable to problems with simple geometries and constant boundary conditions, and it may not accurately represent the behavior of the electric field and potential in more complex systems. Additionally, the method may not work for problems involving moving charges or time-varying fields.

Similar threads

  • Introductory Physics Homework Help
Replies
1
Views
1K
  • Introductory Physics Homework Help
Replies
11
Views
736
  • Introductory Physics Homework Help
Replies
4
Views
3K
  • Introductory Physics Homework Help
Replies
21
Views
709
  • Introductory Physics Homework Help
Replies
1
Views
852
  • Introductory Physics Homework Help
Replies
1
Views
740
  • Introductory Physics Homework Help
Replies
4
Views
4K
  • Introductory Physics Homework Help
Replies
2
Views
469
  • Introductory Physics Homework Help
Replies
14
Views
882
  • Introductory Physics Homework Help
Replies
2
Views
415
Back
Top