6. Write down the electrostatic force equation and define each letter and symbol in it. Then compute the electrostatic force between two charged objects of 108.18 and 18.18 coulombs respectively if they are at a distance from one another of 1818 meters. Show your calculations.

7. Referring to the system in Question 6 above, put down an appropriate question involving a calculation of the net electrostatic forces exerted by those two objects on the third object with a charge of 120 coulombs. (The three objects cannot all be in one straight line.) Draw a sketch of the system in the question, labeling the key quantities. Then answer the question.