List of top Physics Questions on Electrostatic potential asked in JKCET

The work done in bringing at a unit positive charge from infinity distance to a point at distance $x$ from a positive charge $Q$ is $W$. Then the potential $ \phi $ at that point is

The depletion layer in a silicon diode is $ 1\,\mu m $ wide and its knee potential is $0.6\,V$, then the electric field in the depletion layer will be

Charges $2q,\, -q$ and $-q$ lie at the vertices of a triangle. The value of $E$ and Vat the centroid of equilateral triangle will be