Consider the following transverse, monochromatic vector waves:

$($a$)E_x(t)=$Asin$(t-kz),E_y(t)=$Acos$(t-kz-\frac{}{2}),$

$($b$)E_x(t)=$Asin$(t-kz),E_y(t)=$Asin$(t-kz-\frac{}{4}),$

For each case, is the polarization linear, circular or a more general elliptical polarization? Draw

a vector snapshot of the fields at a given instant in time. k is the wave vector, $2\frac{}{}.$