Vector field $\displaystyle F(x,y,z) = xi + 0j + zk$ and the cylinder obtained by rotation the straight $\displaystyle x=1, y=t, z=0$ with $\displaystyle -1 \leq t \leq 1$ around the OY axis. Determine the flow of the field F in the direction normal outside of the cylinder. (the normal vector points to out)