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A circular disk of 10 cm radius is charged uniformly with a total charge of Q coul. Find the electric field intensity at a point 20 cm away from the disk, along its axis.
(b) Consider a uniformly charged right circular cylindrical shell having total charge Q, radius R, and height h. Determine the electric field at a point a distance d from the right side of the cylinder, as shown in Fig. 3. (Hint: treat the cylinder as a collection of ring charges.)
(c) Consider now a solid cylinder with the same dimensions and carrying the same charge, which is uniformly distributed through its volume. Find the field it creates at the same point. (Hint: treat the cylinder as a collection of disk charges.)

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