A long conducting rod of radius R1 and length L sits inside of a cylindrical shell of radius R2=10(R1) and length L The net charge on the rod is Q and the net charge on the shell is -2Q.
a) What is the E-field at r=2(R2)
b) What is the direction of the E-field at r=2(R2)?
c) What is the E-field at r= (1/2)(R2)?
d) What is the direction of E there?