Three charges $2 q,-q$ and $-q$ are located at the vertices of an equilateral triangle. At the center of the triangle
the field is zero but potential is non$-$zero.
the field is non$-$zero but potential is zero.
both field and potential are zero
both field and potential are non$-$zero
A conducting sphere of radius $R$ is given a charge $Q$. The electric potential and the electric field at the centre of the sphere respectively are
An infinite number of charges each numerically equal to q and of the same sign are placed along the $x-$ axis at $x = 1,2,4,8.... \,metres$. Then the electric potential at $x = 0$ due to this set of charges is
Derive an expression for electric potential at a point due to a system of $\mathrm{N}$ charges.
A charge $Q$ is distributed over three concentric spherical shell of radii $a, b, c (a < b < c)$ such that their surface charge densities are equal to one another. The total potential at a point at distance $r$ from their common centre, where $r < a$, would be
The ratio of electric potentials at the point $E$ to that at the point $F$ is