Two masses (each with mass 25 g) are 5 mm apart on a frictionless table. Each has –50 mC of charge.
1) What is the magnitude of the net electric force on one of the charges?
2) What is the initial acceleration of each charge if they are allowed to move?
3) How many times greater is the electric force than the gravitational force in this case?
4) It is sometimes said that gravity is an extremely weak force. Demonstrate this by calculating the gravitational attraction among the two masses in this case. [Hint: use Newton’s Law of Gravitation]