What is a system? a. a definite quantity of matter enclosed by a boundary b. a definite quantity that does no work c. a definite quantity that contains all energy d. a definite quantity that allows no heat to flow

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v