1. The electric potential for a point charge, q, a distance r away is V = . We know the zero point is for electric potential is arbitrary, but in this case there is a convenient, useful choice. What is it? 2.) V = 0 atro b. V =0 when r=0 HITE - e. V = 0 when =R d. V 0 when = V never equals zero 2. Which of the following is/are true about equipotentials? - Equipotentials consist of points of constant potential, or voltage b. Electric field lines are normal to equipotentials c. Equipotentials of different values may never cross a., b. and e. are all true. e none of the above are true. 3. Consider a thin rod of length L carrying uniform charge density. 1. A coordinate system is chosen such that the origin is at one end of the rod and the rod is along the I-axis. What is the electric potential at ar=L+d? . a In (44) itIn (tha) c in (4) d. tein () e In (d+L) 4. How much voltage is required to charge a 0.05 F capacitor to the point that it stores 0.25 J of energy? a. 32 V b. 4.5 V c. 10 V d. 20 V e. 100 V v= cva 0.25= 1 (0.cs) v² 6.23 = a.crgo cvzu ya 6.25