MY NOTES ASK YOUR TEACHER (a) A small plastic bead with a mass of 17.8 g and a charge of -0.664 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 pc/m). HC/m2 (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 Need Help? Submit Answer PRACTICE ANOTHER Select-- Read It m/s