In each case below (i) show mathematically that the field given is a straight line, a circle or an ellipse (ii) find an expression for the angle Psi between the field vector and the x-axis. (iii) In each case describe the type of polarization. E= (jx+y)e^-jkz E= [(1+j)y+(1-j)z]e^-jkx E= [(2+j)x+(3-j)z]e^-jky E= (jx+j2y)e^-jkz