(a) A small plastic bead with a mass of 11.4 g and a charge of -0.702 C is suspended in equilibrium above the center of a large, horizontal sheet of rubber that has a uniform charge density on its surface. Find the charge per unit area on the rubber sheet (in C/m). C/m (b) What If? What are the magnitude and direction of the acceleration of the piece of plastic if its charge is doubled? (Enter the magnitude in m/s.) magnitude direction m/s -Select-