Electronics and Communication Engineering - Exam Questions Papers - Discussion

2. 

Calculate the electrostatic force of repulsion between two mica particles at a distance of 10-13 m from each other. Charge on a particle is 3.2 x 10-19 C. (relative permittivity for mica is 5)

[A]. 1.843 x 10-15 N
[B]. 9.2 x 10-2 N
[C]. 14.41 x 10-9 N
[D]. none of these

Answer: Option D

Explanation:

By Coulomb's law:

Electrostatic force = =

= 18.43 x 10- 3 N.


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