Stream and velocity potential functions for a two dimensional flowfield given by u = 2x and v = - 2y are
(a) $$\psi = 2xy, \phi = x^2 - y^2$$
(b) $$\psi = x^2 - y^2, \phi = 2xy$$
(c) $$\psi = x^2y^2, \phi = x^2 + y^2$$
(d) $$\psi = x^2 + y^2, \phi = x^2y^2$$

A

(a)

B

(b)

C

(c)

D

(d)