Which is the most accurate description of compounds? select one: a. they are the basic building blocks of matter. b. they are not pure substances. c. they are made up of atoms of 2 or more elements that are chemically combined. d. they are made of only 1 type of atom.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c