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

Conservation of Charge

  • #1

Homework Statement



In the figure 21-40, three identical conducting spheres form an equilateral triangle of side length d = 24.0 cm. The sphere radii are much smaller than d and the sphere charges are qA = -3.45 nC, qB = -3.91 nC, and qC = +6.09 nC. (a) What is the magnitude of the electrostatic force between spheres A and C? The following steps are taken: A and B are connected by a thin wire and then disconnected; B is grounded by the wire, and the wire is then removed; B and C are connected by the wire and then disconnected. What now are the magnitudes of the electrostatic force (b) between spheres A and C and (c) between spheres B and C?
http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c21/fig21_41.gif



Homework Equations


F = kq1q2/r^2


The Attempt at a Solution



I got 3.28 x 10^-6 N for part A... not sure what to do for B and C
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,090
4
... not sure what to do for B and C
Follow the subsequent steps. When A and B are connected what charge ends on each? Then B is rounded so the charge on B is now 0. Now B and C are connected and you end up with how much charge on B and C?

Now it looks like you're back to calculating forces again.
 

Related Threads for: Conservation of Charge

  • Last Post
Replies
11
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
7
Views
1K
Replies
3
Views
12K
  • Last Post
2
Replies
28
Views
6K
Replies
1
Views
793
Top