Sphere A
to the right has a charge of - 4.0 x 10 -5 C and sphere B
has a charge of - 6.0 x 10 -3 C. How far apart are
the spheres if there is a 150 N repulsive force?
A.
2.50 m
Q1Q2
F = k ---------
r2
Q1Q2
r = ( k -----------) 1/2
F
(- 4.0 x 10 -5C) (-6.0 x 10 -3C)
r = ( 9.0 x 109 Nm2C -2
-----------------------------------------) 1/2 = 3.79 m
150 m
