1. The problem statement, all variables and given/known data Hollow dielectric cylinder, with inner radius a, outer radius b, and height 2h is uniformly polarized by volume. Polarization vector is normal on the bases of a cylinder. Intensity of polarization vector is given, P. The surrounding area is vacuum. Calculate intensity of electric field in center of the cylinder (at point C) 2. Relevant equations -Cylindrical geometry -Polarization vector 3. The attempt at a solution If approximated, intensity of electric field could be E= -P/ε0 (field between two oppositely charged planes). But, we don't know the exact values for dimensions of a cylinder. Could someone give a hint on this, I am stuck here for a while. The result should be E= -Ph( 1/(√a2+h2)-1/(√b2+h2)) / ε0 Thanks for replies.