1. Induced charge distribution of metallic sphere Feng lei

3. What is a chromatic image supposed to be ? A colorized image is a matrix which has a dimension of 3 ×M ×N, and the index of which represents corresponding pixel. Each M ×N matrix is supposed to be a color element matrix of the image in RGB color space. M ×N

4. RGB color space A specified color has three elements: Z R (0,1) Z G (0,1) Z B (0,1) To illustrate the density of charge by color, we have to define a spectrum of these colors first.

5. There are many ways to make a color band. I only choose one plane (Z R -Z B ) of RGB color space to define my spectrum.

6. How to convert induced charge density to color distribution ? The simplest way is to find a linear relation between them. Then I get that k must be the maximum of σ.

7. How will R/d change the relative density ? R/d varying in the scope of (0.1,0.9) and θ ∈ (-Pi, Pi).

8. What dose it look like in the mapping plane? R/d=0.1R/d=0.3R/d=0.7 x-y y-z

9. What about the condition near the limit point ? R/d=0.9 R/d=0.99 Those induced charges just appears locating on one point.

10. Let’s do something more interesting! How about adding another two point charges outside the metallic sphere? R/d=0.4

11. How about adding two negative point charges outside the metallic sphere? R/d=0.4

12. How about just changing the distance of the point charge outside the metallic sphere? R/d=0.7 R/d=0.3

13. Finally, here are two interesting graphs mapped in y-z plane. Can you guess how the point charges locate? Y-Z

14. Actually, it’s the situation below:

15. Thanks for your attention! It is wrong but gorgeous anyway.