Question 1 Two plastic balls, each of radius 14.9 cm, are placed so that there is a 18.6 cm space between them. The charge on one ball is +6.60 nC and the charge on the other is -2.20 nC. What is the magnitude of the electric field at a point directly midway between the two balls? 675 N/C 2.29103 N/C 3.56103 N/C 1.35103 N/C Question 2 -30 A water molecule has a permanent dipole moment of 6.2010 Cm, and if you put one in an electric field it will feel a torque and try to rotate (this is essentially how a microwave oven works, although that electric field oscillates). What is the torque on the molecule if its dipole moment is oriented at 24.6 with respect to the electric field, which has a strength of 2.97104 N/C? 9.3510-26 Nm 5.5910-26 Nm 7.6710-26 Nm 1.8410-25 Nm Question 3 A charged 1.20 g glass bead hangs suspended in the air by an electric field. If the bead was charged by the removal of 7.201010 electrons, what must the electric field magnitude be? 1.02106 N/C 1.6310-13 N/C 8.641010 N/C 1.04108 N/C