Two points charges `q_1 and q_2` are placed at a distance of 50 m from each each other in air, and interact with a certain force. The same charges are now put in oil whose relative permittivity is 5. If the interacting force between them is still the same, their separation now is

Options

A. `16.6m`
B. `22.3m`
C. `28.4m`
D. `25.0m`

Answer

B

Explanation

`1/(4piepsilon_0).(q_1q_2)/r_1^2=1/(4piepsilon_0k).(q_1q_2)/r_2^2)`
`:. r_2=r_1/sqrtk=50/sqrt5`
`=22.36m`