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

108 electrons are equally spaced around a circle of radius 10.0 cm.

What is the electric field at the center of the circle?

What would be the electric field be at the same location if one electron was removed?

2. Relevant equations

[tex]\begin{flalign*}E & = & & k \ \frac{1}{4 \pi \epsilon_0} \ \frac{q}{r^2}\hat{r}\\\end{flalign*}[/tex]

3. The attempt at a solution

For the first part we know that the electric field is zero because for every electron on one side there is exactly one opposite and the E from each cancel out.

The second part is where I am a little confused. We are removing one of the electrons so basically we are making one of them negative? Since before the field was zero really we just need to find the field for the one negative electron. Because it's negative it will change directions to be from removed charge to center of circle? r = 10 cm. What is q and what exactly are we solving for here and how?

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# Homework Help: Electric Field

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