Homework Help: How to determine the charged particles between a distance?

1. Jul 17, 2011

oem7110

I would like to determine the negative charged level on q2 particle, referring to following image, q1 is charged particle with x unit of positive charge, which q1 diameter is 80 cm, on the other hands, q2 is a neural particle, which q2 diameter is 30 cm. Both charged particles are separated in d distance.
Does anyone have any suggestions on how to determine the negative charged level on left-hand side of q2 based on the distance and positive charged level of q1? Is there any formula to determine this value?
Thanks in advance for any suggestions

2. Jul 18, 2011

SammyS

Staff Emeritus
Are they conductors?

Is d the center to center distance?

3. Jul 18, 2011

cupid.callin

They must be conductors ... or else, there will be no induced charges.

4. Jul 18, 2011

SammyS

Staff Emeritus
To cupid: q1 would not need to be a conductor. If it were not a conductor, I think the problem is more difficult to solve.

To oem7110: If the spheres are conductors, then what do you know about the surface of each sphere?

5. Jul 18, 2011

oem7110

To SammyS:
Let assume, both particles are conductors, so positive and negative charges are free to move on its surface area, and d is the center to center distance.
Does anyone have any suggestions?
Thanks in advance for any suggestions

6. Jul 18, 2011

SammyS

Staff Emeritus
The surface of each conductor will be an equi-potential surface.

Have you been introduced to "image" charges at all?

7. Jul 18, 2011

oem7110

What is "image" charges?

In q2 particle, which is neutral originally, because q1 with positive charged particle is getting closer to q2, so the negative charged level on left-hand side and the positive charged level on right-hand side for q2 particle, but I don't know what happen at the top and bottom, will it be neutral?
Does anyone have any suggestions on how to determine the negative charged level on left-hand side of q2 based on the distance and positive charged level of q1? Is there any formula to determine this value?
Thanks in advance for any suggestions

8. Jul 19, 2011

oem7110

Could you please give me any suggestions on what Image charges are about?

Do you find any lecture under MIT talking about this issue? so I can learn what "image" is about if it related to my issue.

Thank everyone very much for any suggestions

Lec 23 | MIT 8.02 Electricity and Magnetism, Spring 2002