Force between two charges separated by a certain distance in air is F. If each charge is doubled and the distance between them is also doubled, force would be

For what order of distance is Coulomb's law true?

The permittivity of medium is $26.55\times {10}^{-12}{C}^2\mathrm{/}N{m}^2\mathrm{.}26.55\backslash times10^\{-12\}C^2/Nm^2.$ The dielectric constant of the medium will be

A glass rod when rubbed with a piece of fur acquires a charge of magnitude $3.2\mu C3.2\; \backslash \; \backslash mu\; C$. The number of electrons transferred is

Choose the correct answer

If a charge is moved against the Coulomb force of an electric field,

Two point charges $+4\mu C+4\; \backslash \; \backslash mu\; C$ and $+2\mu C+2\; \backslash \; \backslash mu\; C$ repel each other with a force of 8 N. If a charge of $-4\mu C-4\; \backslash \; \backslash mu\; C$ is added to each of these charges, the force would be

The electric field intensity at a point 2 m from an isolated point charge is 500 N/C. The electric potential at the point is

The dimensional formula of electric field intensity is

A force of 2.25 N acts on a charge of $15\times {10}^{-4}15\; \backslash times\; 10^\{-4\}$C. Calculate the intensity of electric field at that point.