Problem: a table tennis ball has a positive charge of 7.0 × 10-8 coulombs. it experiences an electric force of 3.6 × 10-4 newtons at a point slightly above a positively charged table. calculate the magnitude of the electric field at this point. part a: enter the variable for the quantity you need to find. use your keyboard and the keypad to enter your answer. then click done.

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.