A hollow ball with radius R = 2 cm has a charge of -4 nC spread uniformly over i

Question

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 = <-3, 0, 0> cm. A point charge of 3 nC is located at P3 = <6, 0, 0> cm. (The diagram below is not drawn exactly to scale.)

https://www.webassign.net/mi3/14-064-HWshell_point.jpg

1.What is the net electric field at location P2 = <0, 5, 0> cm?

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

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 = cm. A point charge of 3 nC is located at P3 = cm. (The diagram below is not drawn exactly to scale.) What is the net electric field at location P2 = cm? At a particular instant an electron is at location P2. What is the net electric force on the electron at that instant?

Explanation / Answer

1) for a pint outside the ball we can assume the charge to be a ponit charge at the centre of the ball

E= -4/4pi epsilon r^2.........r= sqrt(3^2 +5^2) = 1.05 N/C

2) Force = E*q = 1.6 *10^-19 * 1.05 N/c = 1.69*10^-19 N

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