finding expression for instantaneous Electric fieldby zak8000 Tags: electric, expression, field, instantaneous 

#1
Jun1811, 12:26 AM

P: 73

1. The problem statement, all variables and given/known data
hi i have been given the following electric field phasor E=(z(5)+x(10))ejpi(y) mV/m Mr=100 e_{r}=3 2. Relevant equations 3. The attempt at a solution i have been able to deduce from the results above that wave is travelling in positive y direction. intrinsic impedance = 2176 ohms from n=sqrt(M/e) wave velocity =17x10^6 ms1 from v=1/sqrt(M*e) wavelength =2pi/k=2 angular frequency=kv=17pi*10^6 so to find instanteous expression for E it should be of the form: E(y,t)=Acos(wtky) E(y,t)=(z(5)+x(10))cos(17pi*10^6*tpi*y) is this correct ? i am just confused because there are two component is the amplitude. so is this valid? and also for the corresponding magnetic field H=(x(5/2176)z(10/2176))ejpi(y) mA/m H(y,t)=(x(5/2176)z(10/2176))cos(17pi*10^6*tpi*y) is this an correct expression for the corresponing magnetic field in instantaneous form? 


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