Question: A disk has radius R = 2.20 cm. Its surface charge density is 1.50 x 10-6 C/m2 from r = 0 to r = R/2

A disk has radius R = 2.20 cm. Its surface charge density is 1.50 x 10-6 C/m2 from r = 0 to r = R/2 and 8.00 x 10-7 C/m2 from r = R/2 to r = R.

(a) What is the total charge on the disk?

(b) With V = 0 at infinity, what is the electric potential at a point on the perpendicular central axis of the disk, at distance z = R/2 from the center of the disk?

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