Assertion (A) In a region of constant potential, the electric field is zero and there can be no charge inside the region.
Reason (R) According to Gauss law, charge inside the region should be zero if electric field is zero.
Statement (A) Inside a charged hollow metal sphere, $$E=0, V \neq 0$$, (where, $$E=$$ electric field, $$V=$$ electric potential).
Statement (B) The work done in moving a positive charge on an equipotential surface is zero.
Statement (C) When two like charges are brought closer, their mutual electrostatic potential energy will increase.
Electrostatic force between two identical charges placed in vacuum at distance of $$r$$ is F. A slab of width $$\frac{r}{5}$$ and dielectric constant 9 is inserted between these two charges, then the force between the charges is
An electric dipole with dipole moment $$5 \times 10^{-7} \mathrm{C}-\mathrm{m}$$ is in the electric field of $$2 \times 10^4 \mathrm{NC}^{-1}$$ at an angle of $$60^{\circ}$$ with the direction of the electric field. The torque acting on the dipole is