railway RRB Technician Grade 1 Mock Test 2024 Physics Electric Charges and Coulomb's Law Coulomb’s Law
The force between two charges when they are separated by a distance ‘r’ in vacuum is F1 . The force when they are separated by a distance ‘2r’ in a medium of dielectric constant K is F2 . The ratio F1 / F2 is :
1
2 K
2
K/4
3
4 K
4
4/K