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7. A hollow conducting spherical shell has radii of 0.80 m and 1.20 m, as shown in the
figure. The sphere carries a net excess charge of -500 nC. A point charge of +300 nC is
present at the center.
What is the surface charge density on the inner surface of the conducting shell?
What is the magnitude of the electric field at a distance of 1.7 m away from the
center of the spherical shell?
a.
b.
+300 DC
0.80 m
-1.2 m

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