What is the force between two small charged spheres having charges of 2 × 10 × 10−7 C placed 30 cm apart in air?
Charge on the first sphere, q1=2×10−7 C Charge on the second sphere, q2=3×10−7 C Distance between the spheres, r=30cm=0.3m F=4πε0r2q1q2 Where, ε0= Permittivity of free space 4πε01=9×109Nm2C−2 F=(0.3)29×109×2×10−7×3×10−7=6×10−3N Hence, force between the two small charged spheres is 6×10−3 N. The charges are of same nature. Hence, force between them will be repulsive.
