A) what is the total charge on the inner surface of B (at r= R_B1)?
B) what is the total charge on the outer surface of B ( at r= R_B2)?
C) what is the electric field for each origon (r<R_A, R_A <r<R_B1, R_B1 < r <R_B2, and r > R_B2)
D) sketch a graph of the electric field as a function of r.
note: for spherically symmetric distributions, dxdydz=4πr^2dr