(Solved): The following figure shows two point charges of opposite charge and equal magnitude. The negative ...

The following figure shows two point charges of opposite charge and equal magnitude. The negative charge is fixed at point $\mathrm{O}$ and initially the positive charge is located at the intermediate point $\mathbf{A}$. An external force ${\mathbf{F}}_{\text{ext }}$ is applied that causes the positive charge to be carried to the end point $\mathbf{B}$. Choose the part of the graph that best describes the potential difference $?V$ between point $\mathrm{A}$ and $\mathrm{B}$ of the phenomenon described above, when the positive charge initially located at point $A$ moves to point $B$. d) b) to) c)