Suppose that the radius of a disk is 21 cm, and the total charge distributed uniformly all over the disk is 5.0 × 10−6 C. (a) Use the exact result to calculate the electric field 1 mm from the center...

Suppose that the radius of a disk is 21 cm, and the total charge distributed uniformly all over the disk is 5.0 × 10−6 C.

(a) Use the exact result to calculate the electric field 1 mm from the center of the disk.

(b) Use the exact result to calculate the electric field 3 mm from the center of the disk.

(c) Does the field decrease significantly?