📘 electrostatics

1. **State the problem:** We are given two electric charges Q₁ and Q₂ located at points with Cartesian coordinates (1, 2, 3) and (−1, −3, 3) respectively. We need to determine:

1. Statement of the problem. We are given point sources at positions $\mathbf{r}_i$ with strengths $\theta_i$, and an observation point $\mathbf{r}$, and we want the total electric

1. Problem statement: A solid conducting sphere of radius $a$ has net charge $2Q$. A concentric conducting spherical shell with inner radius $b$ and outer radius $c$ has net charge