Hollow Cylinder, Each

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The Hollow Cylinder Apparatus demonstrates how an electrostatic charge resides only on the outer surface of a conductor. Two pith balls are suspended inside the cylinder, and another pair is suspended on top. When the cylinder is charged, the outer balls will diverge, but the inner ones will be unaffected. The metal cylinder measures 2 inches in diameter x 4 inches long and is mounted on an insulating rod attached to a base that measures 11.75 inches tall.