Question

Please help! Thank you! The info need to answer is in the second photo!

Answer 1

The difference is in the directions of their exit points. For election, $x_{f}$ is negative. While for positron $x_{f}$ is positive. The reason for this difference is that the electron is negatively charged while the positron is positively charged. Their response to the electric field is the acceleration gained in opposite directions, and hence their motion in opposite directions .

The similarity is the same magnitude of $x_{f}$ and $y_{f}$ for both electron and position. The reason is that although the electron and positron are oppositely charged they have the same magnitude of their charge which is $1.6\times 10^{-19}$ C. Therefore, the acceleration that the electric field produces for both them have the same magnitude .