What will be the force on charge \(q_2\) due to another charge \(q_1\) separated by distance \(r\) in a medium with relative permittivity \(\epsilon_r\)?

**Details and Assumptions**

- \(\epsilon_0\) is permittivity of vacuum
- \(\hat{r_{12}}\) is unit vector in the direction of \(q_1\) with respect to \(q_2\) and vice-versa.

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