(Solved): A charge \( Q \) is placed in center of two concentric dielectric spheres. (a) Find the electric f ...

A charge \( Q \) is placed in center of two concentric dielectric spheres. (a) Find the electric field and the polarization vectors in the three regions. (b) Determine the surface bound charge densities on the two spherical surfaces at \( r=R_{1} \) and \( r=R_{2} \).