• Support PF! Buy your school textbooks, materials and every day products Here!

Force between 2 charges

  • Thread starter Ry122
  • Start date
  • #1
565
2
Each of two small non-conducting spheres is charged positively, the combined charge being 40C . When the two spheres are 50 cm apart, each sphere is repelled from the other by a force of magnitude 2.5 N. Determine the magnitude of the smaller of the two charges

my attempt:
use eq. F=kq1q2/d
2.5=((9x10^9)(40-q2)(q2))/.5
this gives me the wrong answer
what am i doing wrong?
 

Answers and Replies

  • #2
Pyrrhus
Homework Helper
2,178
1
You forgot r is square.
 

Related Threads for: Force between 2 charges

Replies
2
Views
2K
Replies
16
Views
11K
Replies
2
Views
2K
Replies
2
Views
537
Replies
4
Views
2K
Top