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Q.
Two charged spheres separated by a distance $'d'$ exert some force on each other. If they are immersed in a liquid of dielectric constant $2$, then what is the force exerted, if all other conditions are same?
Given : Distance between two charges $=d$.
and dielectric constant $(k)=2$. Force between two charged spheres $(F)=\frac{1}{4 \pi \varepsilon_{0}} \times \frac{q_{1} q_{2}}{r_{2}}$, where $\varepsilon_{0}$ is
permitivity of free space. and force for a medium wit dielectric constant $k$
$F'=\frac{1}{k} \times \frac{1}{4 \pi \varepsilon_{0}} \times \frac{q_{1} q_{2}}{r_{2}}=\frac{F}{k}=\frac{F}{2}$