Potential due to Point Charge — Prelims Questions

A point charge of $+4,\text{nC}$ is located at the origin. What is the electric potential at a point $P$ located at $(3,\text{m}, 4,\text{m})$?

Two point charges, $Q_1 = +6,\text{nC}$ and $Q_2 = -2,\text{nC}$, are placed at $(0,0)$ and $(6,\text{m},0)$ respectively. What is the electric potential at the midpoint of the line joining the two charges?

How does the electric potential $V$ due to a point charge vary with distance $r$ from the charge?

If the electric potential at a point due to a point charge is $100,\text{V}$ and the electric field magnitude at the same point is $50,\text{N/C}$, what is the distance of the point from the charge?

Work done in moving a charge of $+3,\text{C}$ from a point A (potential $V_A = +20,\text{V}$) to a point B (potential $V_B = -10,\text{V}$) is:

Which of the following statements about electric potential due to a point charge is INCORRECT?

Three point charges, each of charge $+q$, are placed at the vertices of an equilateral triangle of side length $a$. What is the electric potential at the centroid of the triangle?