Final answer:
The vector E in unit vector notation is Ē = 0.111i^ + 0.111j^.
Step-by-step explanation:
To write the vector E in unit vector notation, we need to write the magnitudes and directions as components using the unit vectors i, j, and k. In this case, since E has a magnitude of 0.111 units and a direction of 90.0°, the unit vector notation would be written as Ē = 0.111i^ + 0.111j^, which corresponds to option A.