A charged particle is held at the center of a spherical shell. The figure gives

Question

A charged particle is held at the center of a spherical shell. The figure gives the magnitude E of the electric field versus radial distance r. The scale of the vertical axis is set by Es = 2.00107 N/C. Approximately what is the net charge on the shell?

A charged particle is held at the center of a spherical shell. The figure gives the magnitude E of the electric field versus radial distance r. The scale of the vertical axis is set by Es = 2.00 times 107 N/C. Approximately what is the net charge on the shell?

Explanation / Answer

1.6e7 = 9e9*q/(0.03*0.03)

q2 = 1.6 x 10^-6 C

q1 = E r^2/k = 0.4e7*(2.5e-2)y2/9e9 = 2.778e-7 C

q_net = 0.2778e-6 + 1.6e-6 = 1.88 x 10^-6 C

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