Electrostatic Pendulum A small balloon is suspended from a support by an insulated thread 100 m 10.0 cm long, as shown in the diagram. A negatively charged ebonite rod is touched to the balloon and then 10 0 am returned to a position 2.00 cm from Negatively Charged Rod the equilibrium position of the 2.00 cm balloon, as shown in the diagram. Refer to the above electrostatic pendulum diagram. If the mass of the balloon is 35.0 g and it swings to an angle of 22.0, from the equilibrium position, what is the electrostatic force on the balloon