# finding expression for instantaneous Electric field

by zak8000
Tags: electric, expression, field, instantaneous
 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))e-jpi(y) mV/m Mr=100 er=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 ms-1 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(wt-ky) E(y,t)=(z(5)+x(10))cos(17pi*10^6*t-pi*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))e-jpi(y) mA/m H(y,t)=(x(5/2176)-z(10/2176))cos(17pi*10^6*t-pi*y) is this an correct expression for the corresponing magnetic field in instantaneous form?

 Related Discussions Introductory Physics Homework 1 Classical Physics 1 Introductory Physics Homework 3 Introductory Physics Homework 0 Introductory Physics Homework 0