19. The horizontal loop at the bottom of the staircase has a radius of 0.71 m. What is the centripetal force that the track exerts on the car when it is in the loop? (Hint: use the velocity value that you
found in question 18)

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.