a second point charge q2 = -3.00 x 10-9C is at the point x = 0.800 m, y = 0 m. Calculate the magnitude and direction of the resultant electric field at the origin due to these charges. (15 pts) 4. A point charge q = 9.00 x 10-9C is at the centre of the cube with sides of length 0.300 m. What is the electric flux through one of the six faces of the cube? (10 pts) 5. How much work is required to move a -40uC charge from an electric potential of -100V to 300V? (B) If the charge accelerates from rest, what is the final speed if it has a mass of 0.05 grams? (15 pts)