Electric fields and charges practice · Mixed difficulty

Hydrogen is situated in an electric field intensity of ${10^{12}}\,N/C$. The force experienced by it is

The force per unit charge is known as_____.

An electric dipole (dipole moment $\mathrm{p}$) is placed at a radial distance $\mathrm{r} \gg \mathrm{a}$ (where $\mathrm{a}$ is dipole length) from a infinite line of charge having linear charge density $+{\lambda}$. Dipole moment vector is aligned along radial vector $\overrightarrow{\mathrm{r}}$ force experienced by dipole is:

Point charges $+ 4q, - q$ and $+ 4q$ are kept on the $x$-axis at points $x = 0,x = a$ and $x = 2a$ respectively, then

Given below are two statements
Statement-I: A point charge is brought in an electric field. The value of electric field at a point near to the charge may increase if the charge is positive.
Statement-II: An electric dipole is placed in a non-uniform electric field. The net electric force on the dipole will not be zero.
Choose the correct answer from the options given below

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Work done by electric field on moving a positive charge on an equipotential surface is always zero.

Reason (R): Electric lines of forces are always perpendicular to equipotential surfaces.

In the light of the above statements, choose the most appropriate answer from the options given below: