Question

Two point charges having equal charges separated by 5m distance experience a force of 10N. what will be the force experienced by them if they are held in water at the same distance. Given Dielectric constant of water is 80.​

Answer 1

Answer:

0.1N

F=4πϵoKr2q1q2

For air, K=1 and hence F=4πϵor2q1q2=8N

In water:-

F=4πϵoKr2q1q2=k8N=808

⟹F=0.1N