(a) A device moves 120 coulombs of charge from point a to b in 8 seconds. the distance between a and b is 6 cm. the energy expended in moving the charge is 600 Ws. calculate the voltage between a and b.
(b) a charge of 8 coulombs is moved from point a to b which are 12 inches apart. the energy expended in moving the charge is 24 Ws calculate the voltage between points a and b.