In the context of electric charge, if all the charges in a figure are point charges, which of the following statements is correct about the electric field at a point not coinciding with any charge?$q$

A thundercloud has a radius of $R$ and is at a potential of $V$ relative to the ground. If the breakdown electric field of air is $E_{\text{break}}$, what is the approximate total charge $q$ on the cloud when the breakdown of the surrounding air is reached?

Four point charges are placed at the corners of a square of side $l$. Each corner has a charge: two adjacent corners have charge $q$ (both positive), and the other two have charge $-q$ (both negative). What is the magnitude of the net electric force on one of the positive charges due to the other three charges?

Two point charges, $q_1$ and $q_2$, are located on the x-axis at positions $x_1$ and $x_2$ respectively. What is the expression for the electric force exerted on $q_1$ by $q_2$?

If every minute, $120C$ of charge flow through a cross section of a wire, what is the average current in the wire?

A positive point charge is placed in a uniform electric field pointing to the right. What is the direction of the force acting on the charge?

What is the electric field at the origin due to a point charge of $-12 nC$ located at $(x,y)$ = $(1.0 \mathrm{cm},0 \mathrm{cm})$?

A thin rod of length $L$ has a uniform linear charge density $\lambda$. What is the total charge $Q$ on the rod?