(Solved): In the figure three identical conducting spheres form an equilateral triangle of side length d=25.7 ...

In the figure three identical conducting spheres form an equilateral triangle of side length $d=25.7\mathrm{cm}$. The sphere radii are much smaller than $d$ and the sphere charges are $q_A=?3.70nC,q_B=?3.27nC$, and $q_C=+7.69nC$. (a) What is the magnitude of the electrostatic force between spheres $A$ and $C$ ? The following steps are taken: $A$ and $B$ are connected by a thin wire and then disconnected; $B$ is grounded by the wire, and the wire is then removed; $B$ and $C$ are connected by the wire and then disconnected. What now are the magnitudes of the electrostatic force (b) between spheres $A$ and $C$ and (c) between spheres $B$ and $C$ ? (a) Number (b) Number (c) Number Units Units Units