How many times, the electric potential of big drop in comparison to small drops which is made of $8$ droplets will be, if all the droplets are identical? Assuming charge on big drop is equivalent to charge on eight small drops.

A parallel plate capacitor is connected to a battery as shown in figure Consider two situations:

$A:$ Key $k$ is kept closed and plates of capacitors are moved apart using insulating handle.
$B:$ Key $k$ is opened and plates of capacitors are moved apart using insulating handle.
Choose the correct option.

As shown in the figure, charges $+q$ and $-q$ are placed at the vertices $B$ and $C$ of an isosceles triangle. The potential at the vertex $A$ is,

Define electric potential due to a point charge and arrive at the expression for the electric potential at a point due to a point charge in its vicinity.