Let E = y ax V/m at a certain instant of time, and calculate the work needed to move a 3 C charge from (1,3,5) to (2,0,3) along the straight line segment joining:
a.) (1,3,5) to (2,3,5) to (2,0,5) to (2,0,3);
b.) (1,3,5) to (1,3,3) to (1,0,3) to (2,0,3)