Initially, both metal spheres are neutral.

Question

In a charging process, 1 × 1013 electrons are
removed from one metal sphere and placed on
a second sphere. Then the electrical poten-
tial energy associated with the two spheres is
found to be −0.061 J .
The Coulomb constant is 8.98755 ×
109 N · m2/C2 and the charge on an electron
is 1.6 × 10−19 C.
What is the distance between the two
spheres?
Answer in units of m.

I KNOW r=Kcx q1xq2/PE

But I tried using the charge of an electron -1.6E-19 for both q1 and q2, yet I still get the incorrect answer...

Answer 1

but there is more than one electron, there are 1E13 electrons per sphere.

Answer 2

I tried using 1E13 as q1 and -1.6E-19 as q2, and I still got it wrong...

Answer 3

You're stupid.. -_-

Answer 4

-1.6E-19 times 1E13 = q1 and q2
((8.98755x10^9)(q1)(q2))/-0.061J = the answer...