# The Electric Field of a Ball of Uniform Charge Density

1. Feb 26, 2008

### TOPOG

1. The problem statement, all variables and given/known data
Let E(r) represent the electric field due to the charged ball throughout all of space. Which of the following statements about the electric field are true?

- E(0) = 0
- E(Rb) = 0
- lim(r -->infin.)E(r) = 0
- The maximum electric field occurs when r = 0.
- The maximum electric field occurs when r = Rb.
- The maximum electric field occurs as r -->infin..

2. Relevant material
A solid ball of radius Rb has a uniform charge density rho .

3. Attempt at a Solution
The true statments that i chose were E(0) = 0, lim(r -->infin.)E(r) = 0, The maximum electric field occurs when r = Rb.

Last edited: Feb 26, 2008
2. Feb 26, 2008

### olgranpappy

...attempt at solution?

3. Feb 26, 2008

### pam

4. Feb 26, 2008

### TOPOG

thank you

5. Feb 28, 2008

### miss_soup

how would u definte E(r) at distance r > rb?

6. Feb 28, 2008

### pam

For r>r_b, E is the same as a point charge.