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  4. A force of 4N is acting between two charges In air. If the space between them is completely filled with glass (ε= 8) then the new force will be

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Q. A force of 4N is acting between two charges In air. If the space between them is completely filled with glass $(\varepsilon= 8)$ then the new force will be

Electrostatic Potential and Capacitance

Solution:

The force between two charged particles having an intervening medium of permittivity $\varepsilon$ is given as $\frac{1}{4 \pi \varepsilon o \varepsilon r } \frac{Q 1 Q 2}{r^{2}}$.
Thus, introducing glass between the charges reduces the force by $\varepsilon (8) $ times.
Thus, new force $=0.5 \,N$.