In the circuit shown in the figure, the potential difference across the $4.5\,\,\mu F$ capacitor is.......$volts$
$2.67$
$4$
$6$
$8$
A thin spherical conducting shell of radius $R$ has charge $q$. Another charge $Q$ is placed at the centre of the shell. The electrostatic potential at a point $P$ at a distance $R/2$ from the centre of the shell is
If there are $n$ capacitors in parallel connected to $V \,volt$ source, then the energy stored is equal to
Two charged spheres of radii $R_1$ and $R_2$ having equal surface charge density. The ratio of their potential is
Two opposite and equal charges $4 \times {10^{ - 8}}\, coulomb$ when placed $2 \times {10^{ - 2}}\,cm$ away, form a dipole. If this dipole is placed in an external electric field $4 \times 10^8\, newton / coulomb$ , the value of maximum torque and the work done in rotating it through $180^o$ will be
Three charges $2q,\, - q,\, - q$ are located at the vertices of an equilateral triangle. At the centre of the triangle