(Solved): 3. In the figure below, a solid NONconducting sphere of radius \( a \) is concentric with a spheri ...

3. In the figure below, a solid NONconducting sphere of radius \( a \) is concentric with a spherical conducting shell of inner radius \( b \) and outer radius \( c \). The sphere has a net uniform charge \( q_{1} \) and the shell has a net charge \( q_{2} \). (The surface area of a sphere of radius \( \mathrm{r} \) is \( 4 \pi r^{2} \) and the volume is \( 4 / 3 \pi r^{3} \).) (a) (8 points) Use Gauss's law to show that the magnitude of the electric field at radial distance \( r