Answer
The vector field $\mathbf{F}(x,y)=y\,\mathbf{j}$ consists of upward-pointing\\
vectors whose magnitude increases as $y$ increases.\\
There is no field defined below the $x$-axis $(y<0)$.
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Work Step by Step
Explanation:
The field $\mathbf{F}(x, y) = y\,\mathbf{j}$ has vectors pointing straight upward because it has only a $j$-component.
The magnitude of each vector is proportional to $y$, so as we move upward, the arrows become longer.
For $y > 0$, the field is nonzero; below the $x$-axis ($y < 0$), the field is undefined or absent.
