All questions are mandatory. Total 26 mark»01id time 60 mins . Each multiple cho
ID: 3308859 • Letter: A
Question
All questions are mandatory. Total 26 mark»01id time 60 mins . Each multiple choice question is 2 maul (total 10) and haa only one correct answer . The subjective question is 15 marks . The subjective questions must be answered on the same sheet (b) P..Ei in the space provided. They will marked on elarity, and to) the point answers Circle the correct answer You only should write the answers, nnd nothing else nt nll (e) None o No scribbling, no ambiguity in answers. Any ambiguity such as multiple selected answers, or corrections etc, will lead to zero marks for that question. (1) Consis the- frequ eral e b) W the the ave in a 1. MULTIPLE CHOICE QUESTIONS (1) If the electric field of a wave can be expressed as E(r,t) [2 cos(wt + ) y _ cos(wt + 2) il V/m, its polarization is (a) linearly polarized. (b) circularly polarized. (c) elliptically polarized. (d) unpolarized. (e) Need more information. (2) In a certain mhedium, E-10 cos(108t-33)V/m. what kind of medium is it? (a) Free space. (b) Lossy dielectric. (c) Lossless dielectric. (d) Perfect Conductor 10 cos( 107t+ kz/v V/m, it can be inferred Given that E that (3) (a) The wave propagates along y (b) The wavelength = 188 m (c) The wave amplitude is 10 V/m. (d) The wavenumber k = 0.33 rad/m. (e) The wave attenuates as it travels. m2 the complex rms electric and magnetic field intensity vec- tors are E. = 3e)4 V/m, and H,2eji A/m, respectively. The time-average power transferred through S in the direc- tion of S equals (4) At all points of a surface whose area vector is S-2Explanation / Answer
1] Since both the terms in y and z direction are cosine with same argument, both are in phase and the wave thus cannot be circular or elliptically polarized. An unpolarized light will have equal magnitude of oscillations in both the perpendicular directions and so it cannot be unpolarized light.
Since there is no phase difference between the components in y and z direction, the wave is linearly polarized. [option a].