Force of attraction between two point charges placed at a distance 'd' is F. What distance apart should they be kept in the same medium, so that the force between them is 2F ?

Explanation

To solve the problem, we need to find the distance \( r \) at which the force between two point charges becomes \( 2F \), given that the force at distance \( d \) is \( F \).

### Step-by-Step Solution:

1. **Understanding the Force Formula**:
The force \( F \) between two point charges \( q_1 \) and \( q_2 \) separated by a distance \( d \) in a medium is given by Coulomb's law:
\[
F = \frac{1}{4 \pi \epsilon_0} \frac{q_1 q_2}{d^2}
...