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Physics 21 Online
OpenStudy (anonymous):

the center of a charged ball with a 2.0 cm diameter and total charge 3.0 nC is 5.0 cm from an infinite plane of a charge with area density -3.0 nC/m^2. What is the force on a proton placed 3.0 cm from the center of the ball between the ball and the plane along an axis through the center of the ball perpendicular to the plane?

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