For all problems, please show explicitly the work that you have done to arrive at your answer. It is helpful to note the property you have used to arrive at your answer, and to include such equation before inserting numerical values. Remember to include units & to mind your significant figures! You may find it helpful to draw a diagram, but this is not required. 1. What are the units of electric potential & electric field? How are they related to one another?

2. Using Fig. 1, calculate the net electric potential at point P due 93 to fixed point charges qi, where i = 1,2,3,4,5. Point P is located at the center point of the square, and the point charges are located at the corners of the pentagon. All sides in Fig. 1 can be 92 regarded as having unit length, 1. Hint: to better organize your solution, it is helpful to calculate the effect of each charge separately before calculating the effect of their sum. 91 P Fig. 1. Fixed distribution of point charges for #2