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Q 1.1) 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 the air?

Solution:

Given,
The Charge on the 1st sphere and 2nd sphere is q1 = 2 x 10-7 C and q2 = 3 x 10-7 C The distance between two charges is given by r = 30cm = 0.3m
The electrostatic force between the spheres is given by the relation:

(a)Given,
The charge on 1st sphere (q1 ) and 2nd sphere (q2) is 0.4 µC or 0.4 × 10-6 C and -0.8 × 10-6C respectively.
The electrostatic force on the 1st sphere is given by F = 0.2N. Electrostatic force between the spheres is given by the relation: