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A 230 nC point charge is placed at the center of an uncharged spherical conducting shell...

A 230 nC point charge is placed at the center of an uncharged spherical conducting shell 28 cm in radius.

a) What is the surface charge density on the outer surface of the shell? Express your answer using two significant figures.

b) What is the electric field strength at the shell's outer surface? Express your answer using two significant figures.

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