3) A +2 C charge is placed in a potential field represented by the equipotential 2C surfaces (i.e. dotted circles). The charge is moved from the initial position "i" to a final position "f". What is the change in voltage AV? A) AV = -10 V IN B) AV = +10 V C) AV = +20 V 30 V D) AV = +30 V 20 V E) AV = -20 V 4) How much work (energy) is required to move the charge from "i" to "f? 10 V A) W = 10] B) W = 20] C) W = 40] D) W = 60 J