List of top Physics Questions on electrostatic potential and capacitance asked in Punjab PMET

Two point-charges $ \pm 10\mu C $ are placed $ 5.00\,mm $ apart, forming an electric dipole. Compute electric field at a point on the axis of the dipole $ 15\,cm $ away from the centre on a line passing through the centre dipole.

Three point charges $ q,\,-2q $ and $ -2q $ are placed at the vertices of an equilateral triangle of side $ a $ . The work done by some external force to increase their separation to $ 2a $ will be

Consider a parallel plate capacitor of $10\,\mu F$ (micro-farad) with air filled in the gap between the plates. Now one-half of the space between the plates is filled with a dielectric of dielectric constant $4$, as shown in the figure. The capacity of the capacitor changes to

The potentials of the two plates of capacitors are $+10\, V$ and $-10\, V$. The charge on one of the plates is $40\, C$. The capacitance of the capacitor is

Intensity of an electric field $E$ due to a dipole, depends on distance $r$ as: