What are the vector directions for the electric fields in each part?

[cse63146]

Homework Statement

Each of the four parts of this problem depicts a motion diagram for a charged particle moving through a region of uniform electric field. For each part, draw a vector representing the direction of the electric field.

http://img509.imageshack.us/img509/6752/partazy5.jpg <-Part A
http://img509.imageshack.us/img509/9706/partbvp7.jpg <-Part B
http://img223.imageshack.us/img223/581/partcjp1.jpg <-Part C
http://img223.imageshack.us/img223/187/partdif8.jpg <-Part D

Homework Equations

The Attempt at a Solution

I know that a negative charge has an electric field that that is radially inward and a positive charge has an electric field that is radially outward.

But I'm still not sure how I'm supposed to draw it. I really hope someone here has experience with masteringphysics

 

[miss_soup]

For the first one, the electric field points to the right because it is a positively charged particle and the acceleration is going to the right. [force and the electric field point in the same direction for a positively charged particle, and in opposite directions for a negatively charged particle.] For the second one, the electric field points to the left because it is a negatively charged particle and the acceleartion is going to the right. I have no idea how to do the next two...i put in a couple of tries using the concepts i developed for part A and B but apparently doesn't work quite the same way.

 

[helpnhand]

miss_soup was correct for the first two and as for second two they also follow the same rules

Part C The drawing of the vector representing the direction of the electric field goes to the right

Part D The drawing of the vector representing the direction of the electric field goes to the left

Conclusion : was a waste of tries thinking outside the box LMAO