Unformatted text preview: SoLuTthw S EE3340 Spring 2010
Practice Problems — Poynting Vector and Polarization 1. At a particular location at an instant of time t, the electric ﬁeld EU) - E.&, where = 200 V/m. At the same location, the magnetic ﬁeld Hm - H,&,, where H0 = 600 mA/m. Find the magnitude and direction of the Poynting vector P - E x H at this
location and instant. F a w
a“ t . . i (11% o to no
(cowl. 'va“: z T E X H 3 ? ;-P‘Qi Pt- — lg: ):
Y a! (h - 2. J‘MIQLHG‘ ) 2. A uniform TEM plane wave has a phasor electric—ﬁeld magnitude of IEsl = 3 Wm.
What is the power density of this wave (in W m‘z) if the medium is 1.
(a)air(e,=1)? prozetmp So pm: \Frl ; .“L (H ““7“?
ET men/t) i (b) alumlna(8-96)° Hf: :35}: [215% 3° “‘73; (1‘2) 1 37.0(MW/w’
V. . 2W A 3. At the plane x=y=0, a uniform plane wave traveling in the +2 direction has this
expression for its electric ﬁeld vector: Sketch an x—y coordinate system and draw a line indicating the path of the electric—ﬁeld
vector during one cycle, and state whether the polarization is linear, elliptical, or circular. —-} Li'lcﬁ‘” ...
View Full Document
- Spring '11