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

Two 4.0 cm diameter disks face each other, 2.0 mm apart. They are charged to +-12 Nc.

Part A

What is the electric field strength between the disks?

E = 1.1 * 10^6 N/C

Part B

A proton is shot from the negative disk toward the positive disk. What launch speed must the proton have to just barely reach the positive disk?

2. Relevant equations

E=(Q/(epsilon zero * A)

v=x/t

3. The attempt at a solution

I was able to figure out part A. I just need help with part B.

V = ?

x = 2mm

t = ?

Doesn't seem like this part should be difficult, so I must be missing something simple...

Thanks in advance for any help.

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# Homework Help: Electric field and velocity

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