Section 6.1 · Home exercises · 8 of 8
Home exercise 6.1.8: A wave towards -z
A wave towards
#A plane wave in a nonmagnetic, lossless medium has
Find
- the direction of propagation,
- , , , the intrinsic impedance and the phase velocity,
- the magnetic field, as a phasor and in the time domain.
Source: M. N. O. Sadiku, Elements of Electromagnetics, Practice Exercise 10.3.
Strategy
A plus sign between and means travel towards . For use with .
a)
The phase is constant where const: the wave travels towards .
b)
and :
c)
, so and, with and ,
Answer
Check
when both sines are positive, and .
Remark
The most common slip with waves towards is to use instead of in . The result would carry power the wrong way, a check worth doing every time.