1. Two charges of magnitude +q are separated by a distance d. Assuming there are no changes to anything else, but the charges are separated by 3 times their current distance, what will happen to the Coloumb force between them? 

A. The new Coloumb force will be 1/9th the original

B. The new Coloumb force will be 1/3rd of the original

C. The new Coloumb force will be 3 times the original

D. The new Coloumb force will be 9 times the original

2.

In the nucleus of an atom, two protons are separated by a distance of 10^-13 m. What is the Coloumb force between them? The charge of a proton is + 1.602 x 10^-19 C. 

	0.023 N
	0.078 N
	0.004 N
	0.051 N

3.

How many electrons must be added to an object to give it an overall net charge of -3.0 x 10^-7 C? The charge of an electron is -1.602 x 10^-19 C. 

	1.9 x 10^12 electrons
	3.1 x 10^13 electrons
	2.0 x 10^10 electrons
	1.4 x 10^14 electrons