Could someone please help me with this physics question? A quick explanation is only needed with the answer as I do not want you to spend to much time

(5) (10 pts.) A uniform magnetic field of magnitude 0.80 T in the negative z- direction is present in a region of space, as shown in the figure. A uniform electric field is also present. An electron that is projected with an initial ve- locity in the positive x-direction passes through the region without deflection. What is the magnitude and direction of the electric field in the region? X X X X X B = 0.80 T O- X X X X X