For 11, how do we know the vector should be pointing this way?

For 12, I do not understand the explanation provided. What is meant by force in new direction? How dow e know the trajectory is not aligned with the electric field line? Could it ever be aligned with the electric field line?

*11. Consider the diagram at left in which the field produced by two point charges is shown. a. Draw five equipotential lines on the diagram. b. Draw the vector representing the force acting on a + particle placed at A. 12. Would this particle follow the field line to B? Why or why not? No it would not. It will begin by accelerating (and moving) in the direction of the force vector. After it has moved a bit it will have a force in a new direction and a Av in that direction. Avis the same direction as the acceleration. Av= vs- vo, 50 we can get the direction of the new velocity vy by adding v, and Av. As can be seen, the new velocity is not in the direction of the field line