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a) $\dfrac{Q_{encl}}{4\pi \epsilon_o r^2}$
b)0
c)$\dfrac{Q_{encl}}{4\pi \epsilon_o r^2}$
d) The shell makes the field zero within the thickness of the shell, but has no effect otherwise. The charge causes the inner surface to acquire a negative charge, and the outer surface is made positive (the shell surface is polarized).

Giancoli 6th Edition, Chapter 16, Problem 50

(4:36)

Chapter 16, Problem 50 is solved.

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