streamlines

For a two-dimensional incompressible flow field given by $\vec{u} = A(x\hat{i} - y \hat{j})$, where A > 0, which one of the following statements is FALSE?

The volume tric flow rate (per unit depth) between two streamlines having stream functions $${\psi _1}$$ & $${\psi _2}$$ is

In a flow field, the streamlines and equipotential lines

Streamlines, path lines and streak lines are virtually identical for