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1. Coulomb’s force between two point charges varies with distance r between them as,$\bar{r}$,$\frac{1}{r}$,$r^{2}$,$\frac{1}{r^{2}}$,$\frac{1}{r^{2}}$
2. Force of attraction between two point charges placed in air at a distance r from each other is F. If these charges are placed in water with same separation between them, then the force of attraction between them is,$\mathrm{F}$,$80 \mathrm{~F}$,$\frac{\mathrm{F}}{80}$,$Zero$,$\frac{\mathrm{F}}{80}$,
3. Value of dielectic constant of a water,increases with increase in temperature of the water,decreases with increase in temperature of the Water,remains the same with increase in temperature of the water nothing can be said,decreases with increase in temperature of the Water
4. The order of the ratio of electrostatic force and gravitational force between a proton and an electron to,$10^{36}$,$10^{39}$ ,$10^{-36}$,$10^{-39}$,$10^{39}$
5. The unit of permittivity of free space $\epsilon_{0}$ is
,$\mathrm{C} \mathrm{N}^{2} \mathrm{~m}^{-1}$
,$\mathrm{N} \mathrm{m}^{-2} \mathrm{C}^{-2}$
,$\mathrm{C}^{2} \mathrm{~N}^{-2} \mathrm{~m}^{-2}$
,$\mathrm{C}^{2} \mathrm{~N}^{-1} \mathrm{~m}^{-2}$
,$\mathrm{C}^{2} \mathrm{~N}^{-1} \mathrm{~m}^{-2}$ ,$\left[\mathrm{e}_{0}\right]=\left[q_{1} q_{2} \mid /\left[\mathrm{F} r^{2}\right]\right.$