Finding charge on an oil drop

  • #1
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
20,925
2,866
If the drop is suspended (not accelerating) that means that the forces are balanced (net force is zero).
 

Related Threads on Finding charge on an oil drop

  • Last Post
Replies
2
Views
504
Replies
8
Views
3K
Replies
1
Views
1K
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
1
Views
4K
Replies
11
Views
7K
Replies
3
Views
4K
  • Last Post
Replies
7
Views
2K
Replies
7
Views
11K
Replies
2
Views
2K
Top