. What is the force between two small charged spheres having charges
of 2×10^-7C and 3× 10^-7 C placed 30 cm apart in air?
Charge on the first sphere, q1=2×10-7C
Charge on the second sphere, q2=3×10-7C
Distance between the spheres, r=30 cm=0.3m
Hence, force between the two small charged spheres is 6×10-3N .
The charges are of same nature. Hence, force between them will be repulsive