Which equation would you use to calculate how much work is done in pushing a rock to the edge of the cliff? A. Ep = w x h
B. Ek = 1/2 x mass x velocity
C. Ek = 1/2 x mass x velocity squared
D. W = F x d

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