If a diaelectric material of dielectric ...

If a diaelectric material of dielectric constant`epsilon_r` is completely filled between two point charges as shown in the figure, then the net electrostatic force on `q_1` is

` 1/(4π epsilon_0) (q_1q_2) /r^2`

` 1/(4π epsilon_0 epsilon_r) (q_1q_2) /r^2`

` epsilon_r/(4π epsilon_0 ) (q_1q_2) /r^2`

zero

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