The table shows the charges and the distance between five different pairs of objects. if the force between two charges, q, separated by a distance, d, is f, what is the list of the other forces, from greatest to least? a) y, z, w, x b) y, w, x, z c) z, y, w, x d) z, x, w, y

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