(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A nonconducting disk of radius a lies in the z = 0 plane with its center at the origin. The disk is uniformly charged and has a total charge Q. Find Ez on the z axis at the following positions. (Assume that these distances are exact.)

Z = a

[__________]Q / (a2εo) - This is the format the answer should be in.

2. Relevant equations

E_{z}= [tex]\frac{kQz}{(z^2+a^2)^{3/2}}[/tex]

k = 1/(2pi*εo)

3. The attempt at a solution

1. E_{z}= [tex]\frac{kQz}{(z^2+a^2)^{3/2}}[/tex]

I filled in 'z' and 'k'

2. E_{z}= [tex]\frac{Qa}{(a^2+a^2)^{3/2}*2\pi*\epsilon}[/tex]

3. E_{z}= [tex]\frac{Qa}{(2a^2)^{3/2}*2\pi*\epsilon}[/tex]

4. E_{z}= [tex]\frac{Qa}{8a^{3}*2\pi*\epsilon}[/tex]

5. E_{z}= [tex]\frac{Q}{(16\pi*a^{2}*\epsilon}[/tex]

6. [tex]1/16\pi[/tex]

7. [_.1963495408_]Q / (a2εo) * Its wrong and I don't know what I did wrong. Please help

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric Charge Question

**Physics Forums | Science Articles, Homework Help, Discussion**