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A ball with a radius of 20 cm is uniformly charged at 80 nC. a. Find...

A ball with a radius of 20 cm is uniformly charged at 80 nC.
a. Find the volume charge density of the ball (C/m³).
b. Find the amount of charge surrounding the spheres with a radius of 5, 10 and 20 cm, respectively.
c. Find the field strengths at 5, 10 and 20 cm from the center of the ball.
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