Two objects, a and b, are held one meter above the horiz'ontal ground. the mass of b is twice as great as the mass of a. if pe is the gravitational potential energy of a relative to the ground, then the gravitational potential energy of b relative to the ground 15? a) pe 13) 2pe c) 2p_e d) 4pe

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