electrostatic force problem helppy...

[Omegachi]

real quick question.

i know that the charge on an electron is 1.6e-19. Is the charge of a proton surrounded by that electron also 1.6e-19 too when they are balanced by electrostatic force.

 

[PrincessGuard]

Yes, protons and electrons have equal but opposite charges.

 

[zzzz]

Originally posted by: Omegachi
real quick question.

i know that the charge on an electron is 1.6e-19. Is the charge of a proton surrounded by that electron also 1.6e-19 too when they are balanced by electrostatic force.

The magnitude is the same but the sign is different. electron is negative and proton positive.
Not sure what you mean by " they are balanced by electrostatic force"

 

[Omegachi]

doh! that doesn't solve the problem i am working on.

here is wha ti am working on:

An electron moves in a circular orbit about a stationare proton. The centripetal force is provided by the electrostatic force of attraction between the proton and the electron. The elctron has a kinetic energy of 2.18e-18 J
(a)what is the speed of the electron?
(b)what is the radius of the orbit of the electron?

i used k=.5mv^2 to find that velocity from the electron is 2.19e6 m/s. for part b i am not sure how to find the r. do i use the centripetal force formula:

F = mv^2 / r

if i use this then i need to know F. F is the electrostatic force? what is the electrostatic force?

 

[res1bhmg]

2 + 3 = 23

 

[zzzz]

read your textbook.
keyword Coloumb attraction force

 

[Omegachi]

can't find it in the book dude.

 

[Evadman]

quick explanation

more involved

 

[Omegachi]

dang it, that don't solve the problem but thanks for the links.

 

[Omegachi]

still lost bump