Paragraph: Consider an evacuated cylindrical chamber of height h having rigid conducting plates at the ends and an insulating curved surface as shown in the figure. A number of spherical balls made of a light weight and soft material and coated with a conducting material are placed on the bottom plate. The balls have a radius r h . Now a high voltage source (HV) is connected across the conducting plates such that the

Step-by-step solution

Balls placed on +ve plate become positive charge and move upward due to electric field. These balls on colliding with negative plate become negatively charged and move opposite to the direction of electric field. Balls placed on +ve plate become positive charge and move upward due to electric field. These balls on colliding with negative plate become negatively charged and move opposite to the direction of electric field.