Potential of concentric cylindrical insulator & conducting shell. Stuck on 2nd question!

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1. Sep 27, 2014

Richard Ros

An infinitely long solid insulating cylinder of radius a = 5.2 cm is positioned with its symmetry axis along the z-axis as shown. The cylinder is uniformly charged with a charge density ρ = 23 μC/m3. Concentric with the cylinder is a cylindrical conducting shell of inner radius b = 14.2 cm, and outer radius c = 16.2 cm. The conducting shell has a linear charge density λ = -0.45μC/m.

1. What is Ey(R), the y-component of the electric field at point R, located a distance d = 58 cm from the origin along the y-axis as shown?
-7897.28N/C

2. What's V(c)-v(a), the potential difference between the outer surface of the conductor and the outer surface of the insulator.
KQ
My Attempt : Vc - Va = kq/c - kq/a
vc - va = qk * (1/c - 1/a)

2. Oct 2, 2014