Finding charge on an oil drop

  • #1
spottedcow913
7
0
In Milikan's experiment, an oil drop of radius 1.64x10^-6 m and density of 0.851 g/cm^3 is suspended in a chamber where the downward electric field of 1.92x10^5 N/C is applied. Find the charge on the on drop.

I know that F=qE, but the drop is suspended so it can't really a force because it has no acceleration. I also know I can find a mass from the info, but, again that doesn't help my force because the drop is suspended. Should I try to use the idea of an electric field due to a point charge?

Thanks for any help!!
 

Answers and Replies

  • #2
gneill
Mentor
20,945
2,886
If the drop is suspended (not accelerating) that means that the forces are balanced (net force is zero).
 

Suggested for: Finding charge on an oil drop

Replies
8
Views
3K
  • Last Post
Replies
2
Views
693
Replies
1
Views
2K
Replies
3
Views
5K
  • Last Post
Replies
7
Views
2K
Replies
11
Views
7K
Replies
2
Views
2K
Replies
6
Views
1K
  • Last Post
Replies
1
Views
5K
Replies
7
Views
12K
Top