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A hollow ball with radius R = 2 cm has a charge of -4 nC spread uniformly over its surface (see the figure).

 A hollow ball with radius R = 2 cm has a charge of -4 nC spread uniformly over its surface (see the figure). The center of the ball is at P1 = <-4, 0, 0> cm. A point charge of 5 nC is located at P3 =<6, 0, 0>cm. (The diagram below is not drawn exactly to scale.)

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 What is the net electric field at location P2=<0, 0,0 >cm?

 At a particular instant an electron is at location P2. What is the net electric force on the electron at that instant?


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