Use MATLAB to solve the following problem:

The sketch shown in Fig. P3.20, which represents the vector field E = rf, consists of arrows pointing radially away from the origin and their lengths increase linearly in proportion to their distance away from the origin. Using this arrow representation, sketch each of the following vector fields.

(a) El=-xy. (b) E2= yx, Figure P3.20 Arrow representation for vector field E- fr (Problem 3.20)