What I meant by Eθ aθ is just according to normal convention. Eθ is the component of electric field in θ direction(as in spherical coordinates) and aθ is the unit vector (it is 'a caps θ' , I cudn't find a proper symbol for that)
So my doubt is what actually is this Eθ(or Eφ) which is a scalor...
It seems no one is here to clear this doubt.
Thanks tech99 for replying. The equation I wrote here is from a text book, so may be they meant peak value.
But no one is saying about, is it possible to make with DC current or my 2nd doubt
I have a few doubts regarding antenna radiation and propogation. Kindly look into it and clarify.
Consider a Hertzian dipole antenna,
DOUBT # 1. Generally, when the power is mentioned for an antenna elements such as the power dissipated across radiation resistance(Rrad)
P radiated =...
Homework Statement
This is a statement i found in one of my textbook of "Antenna analysis".
The phase front of a exponential time varying quantity(charge distribution) 'ejwt' is a spherical wave front and is represented by e-jkR.
Homework Equations
1. How can we represent spherical...
Go through this thread if u still havent found it. Dont know its conclusion..but just sharing.
https://www.physicsforums.com/threads/magnetic-fields-do-no-work-how-come.347539/
From what i know, A field (which is actually force itself presented in a two-step process) does no work only if the displacement produced by that force is in a direction perpendicular to force. i.e.,
W = |F||d|cosΘ
If Θ =90°, w=0
Here. the displacement created by the electromagnets is in the...
Yes. I was indeed considering a wave related to E field. Scalar potential(electric) 'V'.
If you are actually removing imaginary portion, you will be neglecting some information in that wave. Which and why?
So this is what I understood based on your reply and my knowledge. Please correct me if I'm wrong.
1. Any wave is treated as a vector(may be becoz wave is energy propagated in a particular direction; magnitude is present; obeys vector law of addition)
2. A plane wave propogates in a plane whose...
I have two questions which has been troubling me:
1. How can we say that meaning of e^(jkR) is a spherical wave travelling in negative R direction. It can be viewed as polar form of vector with magnitude 1, but how a spherical wave?
2. When we take instantaneous value of a complex quantity ...
I followed the method u suggested only but still getting the same expression.
Here are equations cocerning the relevant terms:
dr/d# =-rsin#sin@ ex +rsin@cos# ey + 0 ez
|dr/d#| = rsin@
which gives,
e# = -sin# ex +cos# ey
And the matrix is,
[Ax] [sin@cos# cos@cos# -sin#] [Ar]
[Ay]...
I was actually studying this inorder to find the spherical coordinates representation of the 'laplacian' of a vector( scalar electric potential)...how to reach into that form for here?
laplacian ∇2V = Vxx +Vyy + Vzz
must be converted to ∇2V = 1/r2 ∂/∂r(r2∂V/∂r) + ...
So here is what i got after grouping the terms acc to cartesian unit vectors...whats next?
A = (Arsin@cos# + A@cos@cos# - A#sin#) ex + (Arsin@sin# + A@cos@sin# + A#cos#) ey + (Arcos@ -A@sin@) ez
Edit: Thanks i was able to complete the solution myself. Thanks for providing me hints and making me...
Ya thanks.
So here is what i have done,
Taking r = rcos@cos# ex + rsin@sin# ey + rcos@ ez
I calculated the partials with respect to r, @ and # from these.
∂r/∂r = cos@cos# ex + sin@sin# ey + cos@ ez
|∂r/∂r| = √cos2@cos2# +sin2sin2# + cos2@
Likewise, i have arrived at the partials and magnitude...
Iam having trouble understanding how one arrives at the transformation matrix for spherical to rectangular coordinates.
I understand till getting the (x,y,z) from (r,th
ie.,
z = rcos@
y = rsin@sin#
x = rsin@cos#
Note:
@ - theta (vertical angle)
# - phi (horizontal angle)
Please show me how...
Thank you guys.
Isnt work = force * distance? By field value did you mean force? Thanks for giving insights into field concept.
Thanks a lot. You have actually cleared my doubt on this particular issue. But in normal cases charges wont exist alone....there will be a group of them no? So an...
Homework Statement
Hello. Im having trouble understanding this particular statement found in one of my textbooks.
" Work done to move a charge along a line perpendicular to the field is zero"
The Attempt at a Solution
Field is a space around a charge where if we place any other charge, will...