A point charge is placed at the center of an unchargedspherical conducting shell

Question

A point charge is placed at the center of an unchargedspherical conducting shell of inner radius 2.5 cm and outer radius4.0 cm (Fig. 24-48). As a result, the outer surface of the shellacquires a surface charge density = 70 nC/cm2. (a) Find the value of the point charge. Answer =______________________ µC
(b) Find the surface charge density on the inner wall of theshell. Answer = ______________ nC/cm2 Okay guys.. I am really having trouble on unitconversion and such here.. If someone would go through the entireproblem I'll rate lifesaver for sure.. I know the sigma formulasand all that I should be using... but I am not getting it correct..Thanks in advance

Explanation / Answer

(a) Find the value of the point charge. Answer = 532x10^7µC
(b) Find the surface charge density on the inner wall of theshell. Answer = 0.9995x10^5 nC/cm2

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