Two charges 6 × 10-8 coulombs and 3 × 10-5 coulombs are located 20 cm apart in a vacuum. If these charges are separated by the same distance in kerosene having a relative permittivity of 2, then the ratio of the force of interaction between them in kerosene to the forces in a vacuum is:
1
0.81
2
1.62
3
0.41
4
0.5