Answer:
3 N
Explanation:
According to the Coulomb's law in electrostatics, the Coulomb force acting between two charges is directly proportional to the product of two charges and inversely proportional to the square of distance between them.
Case I :
F = 300 N, d = 33 cm
300 ∝ 1/ 3^2
300 ∝ 1/9 ..... (1)
Case II:
Let F be the force, d = 30 cm
F ∝ 1/30^2
F ∝ 1/900 ....(2)
Dividing equation (2) by equation (1), we get
F / 300 = 9 / 900
F = 300 / 100
F = 3 N
