Force on a sphere in a constant external electric field

  • #1

Homework Statement


An uncharged solid sphere is paced in a constant external electric field E0. What is the force on the sphere?


Homework Equations





The Attempt at a Solution


I know ( already have found ) the electric potential and electric field around the sphere. Also worked out the surface charged density. I don't know how to calculate the force..Any help please?
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,097
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Isn't F = q*E ?
 
  • #3
It seemed too simple somehow... Is q the induced charge on the sphere, and E the electric field close to the sphere??

Thank you for your help
 
  • #4
LowlyPion
Homework Helper
3,097
5
It seemed too simple somehow... Is q the induced charge on the sphere, and E the electric field close to the sphere??

Thank you for your help

If there is charge separation, what will the net force be?
 
  • #5
Got it! Thanks a lot for the help!!
 
  • #6
6
0
This is the exact question i was looking for help with and still not sure of what the next step is.

I know the uniform E-field causes the sphere to gain an induced dipole. From this how do you get the force? Is it ok to just assume the E-field remains uniform.. this can't be right as there would then be no force and seems there must be a force from the way the question is worded.
 

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