Register to reply

Finding expression for instantaneous Electric field

by zak8000
Tags: electric, expression, field, instantaneous
Share this thread:
zak8000
#1
Jun18-11, 12:26 AM
P: 74
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?
Phys.Org News Partner Science news on Phys.org
What lit up the universe?
Sheepdogs use just two simple rules to round up large herds of sheep
Animals first flex their muscles

Register to reply

Related Discussions
Finding Electric Field from Electric Potential Introductory Physics Homework 1
Relation between Polarization and electric field for instantaneous response Classical Physics 1
Expression of Electric Field with known charges Introductory Physics Homework 3
Finding the relationship between electric potential and the electric field Introductory Physics Homework 0
Help with getting an expression for Electric field from a variable Voltage Introductory Physics Homework 0