What is the force between two small charged spheres having charges of 2 × 10–7C and 3 × 10–7C placed 30 cm apart in air?
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F=1/4 pi epsinot x q1q2/r^2
1/4 pi episinot=9x10^9
q1=2x10^-7
q2=3x10^-7
r=0.3m
F=(9x10^9x2x10^-7x3x10^-7)/(0.30)^2
=(9x2x3)x(10^9-7-7)/0.09
=54x10^-5/0.09
=0.6x10^-8
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