Coulomb’s law problems

This is the post of coulomb’s law tutorial mainly based on coulomb’s law problem. If anyone interested to learn about the definition and derivation of coulomb’s law click here. For coulomb’s law examples some coulomb’s law problems are given below

Problem 1: Find the repulsive Coulomb force between two protons in a nucleus of iron?

Problem 3: A particle charged with 20C placed 50cm from another 70C charged particle. Find the force between them.

Solve:

Given,   q­₁ = 20C

q ₂ = 70C

Distance, r = 50cm

= 0.5m

Force, F =?