1. The problem statement, all variables and given/known data An infinitely long solid insulating cylinder of radius a = 2.5 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 30 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of inner radius b = 15.3 cm, and outer radius c = 19.3 cm. The conducting shell has a linear charge density λ = -0.32μC/m.d=51cm. What is V(c) - V(a), the potentital difference between the outer surface of the conductor and the outer surface of the insulator? 2. Relevant equations ΔV=-∫E*dr. E=λ/2ε0 3. The attempt at a solution ΔV=Vab+Vbc; Eab=λ/2ε0; Ebc I used flux EA=Qenc/ε0 → E=(Qenc)/2*∏*r*L*ε0 → Vbc=∫(b→c) (Qenc)/(2*∏*r*L*ε0 ) *dr This is basically how I did it, But I got the wrong answer -4397..Please help me ??