A. Evaluate the electric field strength at the inner surface of an iron cylinder

Question

A. Evaluate the electric field strength at the inner surface of an iron cylinder if a = 1.5cm, b = 3.0cm, L = 10cm, and I = 21A. E_inner = ? B. Evaluate the electric field strength at the outer surface of an iron cylinder if a = 1.5cm, b = 3.0cm, L = 10cm,, and I = 21A. E_outer = ? A hollow metal cylinder has inner radius a a, outer radius b b, length L L, and conductivity c sigma. The current I I is radially outward from the inner surface to the outer surface. Evaluate the electric field strength at the inner surface of an iron cylinder if a = 1.5cm, b = 3.0cm, L = 10cm, and I = 21A. E_inner = ? Evaluate the electric field strength at the outer surface of an iron cylinder if a = 1.5cm, b = 3.0cm, L = 10cm,, and I = 21A. E_outer = ?

Explanation / Answer

a)

E = J/sigma = (i/(2 pi a L))/sigma = (21/(2*3.1416*0.015*0.10))/(1/10e-8) = 2.23 x 10^-4 N/C

b)

E = J/sigma = (i/(2 pi b L))/sigma = (21/(2*3.1416*0.03*0.10))/(1/10e-8) = 1.11 x 10^-4 N/C

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