- #1
Drizzy
- 210
- 1
Homework Statement
A small ball has been loaded so that its charge is -2.6 nC. Another similar ball has the charge +1.2 nC. The balls are located at the distance 2.5 cm from each other . With how much force do the balls attracts each other?
Homework Equations
F = k * (Q1 * Q2)/r2
The Attempt at a Solution
k = 8,99 * 109
Q1 = -2.6 n
Q2 = +1.2 n
r2 = 0,00252
F = 8,99 * 109 (-2.6 * 1.2)/0,00252
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This is what my book has written:
F = 8,99 * 109 (-2.6 * 10-9 1.2 * 10-9)/0,00252
So my question is: From where did they get 10-9?