Two positively charged identical spheres separated by a distance 'd' exert some force (F) on each other when…
Two positively charged identical spheres separated by a distance 'd' exert some force (F) on each other when they are kept in air. If both the spheres are immersed in a liquid of dielectric constant 5 , the force experienced by each is (All other parameters are unchanged.)
$5 \mathrm{~F}$
$\frac{F}{3}$
$\frac{F}{4}$
$\frac{F}{5}$
Solution
The ratio of force when the medium is changed will be:
$\frac{\mathrm{F}_1}{\mathrm{~F}_2}=\frac{1}{\mathrm{k}}$
Here, $\mathrm{k}=5$,
Therefore, the force experience by each will be $\frac{F}{5}$