Question

The electric force between two charges placed in air is 2 newton. When placed in a medium of €r = 80,the force reduced to will be?

Answer 1

Relationship is
$\frac{f1}{f2} = \frac{e2}{e1}$
Which says f1 is 2
And e2 = 80
So the f2 will be
e1/40
Here, e is epsilon