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Help with acceleration due to electric field

by goWlfpack
Tags: acceleration, electric, field
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goWlfpack
#1
Sep6-08, 02:29 PM
P: 51
1. The problem statement, all variables and given/known data
An electron is accelerated by a constant electric field of magnitude 280 N/C.
(a) Find the acceleration of the electron


2. Relevant equations
E=qF
F=MA


3. The attempt at a solution
Ok so it seems that i should use the equations above to solve the problem, however, the values that im getting for the elementary charge and mass of an electron do not give me the correct answer. help??
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LowlyPion
#2
Sep6-08, 02:37 PM
HW Helper
P: 5,341
Quote Quote by goWlfpack View Post
1. The problem statement, all variables and given/known data
An electron is accelerated by a constant electric field of magnitude 280 N/C.
(a) Find the acceleration of the electron


2. Relevant equations
E=qF
F=MA


3. The attempt at a solution
Ok so it seems that i should use the equations above to solve the problem, however, the values that im getting for the elementary charge and mass of an electron do not give me the correct answer. help??
What numbers are you using for what?
goWlfpack
#3
Sep6-08, 02:41 PM
P: 51
I'm using -1.602*10^-19 C
for the charge

and 9.1095*10^28g
for the mass

LowlyPion
#4
Sep6-08, 02:48 PM
HW Helper
P: 5,341
Help with acceleration due to electric field

Quote Quote by goWlfpack View Post
I'm using -1.602*10^-19 C
for the charge

and 9.1095*10^28g
for the mass
Are you using your units correctly? You gave me grams for the electron mass which is right but you need to properly account for it with the Force from Coulombs of charge.
goWlfpack
#5
Sep6-08, 02:55 PM
P: 51
Quote Quote by LowlyPion View Post
Are you using your units correctly? You gave me grams for the electron mass which is right but you need to properly account for it with the Force from Coulombs of charge.
im not quite sure how that would effect it? what units should i be using?
LowlyPion
#6
Sep6-08, 03:16 PM
HW Helper
P: 5,341
Quote Quote by goWlfpack View Post
im not quite sure how that would effect it? what units should i be using?
You can use whatever units you wish, except that Newtons for instance are kg*m/s2 and are measured against kilograms of Mass, and not grams. Just so you are properly accounting for that is my point.
goWlfpack
#7
Sep6-08, 06:43 PM
P: 51
thanks. ha i feel really stupid. that was an easy fix. talking about overlooking something. thanks again! :)
LowlyPion
#8
Sep6-08, 06:56 PM
HW Helper
P: 5,341
Quote Quote by goWlfpack View Post
thanks. ha i feel really stupid. that was an easy fix. talking about overlooking something. thanks again! :)
Don't feel bad. Units are a very common oversight.

Pretty smart guys can make the simplest mistakes and oversights.:

http://www.cnn.com/TECH/space/9909/30/mars.metric/


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