We are usually not aware of the electric force acting between two everyday objects because A. the electric force is one of the weakest forces in nature. B. the electric force is due to microscopic-sized particles such as electrons and protons. C. the electric force is invisible.

After a glass rod is rubbed with silk, it is observed to have a net charge of +24 nC. Which of the following statements correctly describes the interaction between the silk and the rod? A. The rod transferred 1.5 x1011 electrons to the silk. B. The rod transferred 1.5 x1011 protons to the silk. C. The silk transferred 1.5 x1011 electrons to the rod. D. The silk transferred 1.5 x1011 protons to the rod.

Two +1 C charges are separated by 3000 m. a). Draw a sketch of the scenario and b) Determine the magnitude of the electric force between them?

5. Three point charges are placed in a line (assume these are alone in space - no large planet nearby to cause a gravitational force): 1.0 nC A -1.0 nC B 4.0 nC C a. 10 cm 10 cm Draw a system schema and free body diagram for each of the charges On your free body diagram color code Newton's 3rd law pairs. b. Find the magnitude of each force in the free body diagram. C. What is the NET electrostatic force (magnitude and direction) on C? d. Since none of these charges are as massive as planets we typically wouldn't calculate the gravitational interaction between them. Assume each object above has the same mass. What mass would they need to be so that the magnitude of the net gravitational force on A is the same as the net electrostatic force on C?