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

Distances greater than $10^{-13}$ m.

Distances less than $10^{-13}$ m

Distance equal to $10^{-13}$ m

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

$2 \times 10^{13}$ from fur to glass

$5 \times 10^{12}$ from glass to fur

$2 \times 10^{13}$ from glass to fur

$5 \times 10^{12}$ from fur to glass

Total charge present in the universe is constant.

Total positive charge present in the universe is constant

Total negative charge present in the universe is constant.

Total number of charged particles present in the universe is constant

$2 \times 10^{13}$ from fur to glass

Total charge present in the universe is constant.

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

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

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

Two point charges $+4 \ \mu C$ and $+2 \ \mu C$ repel each other with a force of 8 N. If a charge of $-4 \ \mu C$ 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

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