The value of electric potential at any point due to any electric dipole is
$k.\frac{{\mathop p\limits^ \to \times \mathop r\limits^ \to }}{{{r^2}}}$
$k.\frac{{\mathop p\limits^ \to \times \mathop r\limits^ \to }}{{{r^3}}}$
$k.\frac{{\mathop p\limits^ \to .\mathop r\limits^ \to }}{{{r^2}}}$
$k.\frac{{\mathop p\limits^ \to .\mathop r\limits^ \to }}{{{r^3}}}$
Two charges $+q$ and $-3q$ are placed on $x-$ axis separated by a distance $d$. ($-3q$ is right of $q$) Where should a third charge $2q$ be placed such that it will not experience any force ?
Electric field inside a uniformly charged sphere of radius $R,$ is ($r$ is distance from centre, $r < R$)
Four charges equal to $-Q$ are placed at the four corners of a square and a charge $q$ is at its centre. If the system is in equilibrium, the value of $q$ is
Charge $q$ is uniformly distributed over a thin half ring of radius $R$. The electric field at the centre of the ring is
A parallel plate capacitor with air between the plates has a capacitance of $9\ pF$ . The separation between its plates is $ 'd'$ .The space between the plates is now filled with two dielectrics. One of the dielectric has dielectric constant $K_1 = 6$ and thickness $\frac {d}{3}$ while the other one has dielectric constant $K_2 = 12$ and thickness $\frac {2d}{3}$ . Capacitance of the capacitor is now ......... $pF$