Recent content by vig

I'll try to answer this to the best of my information. 1. In antenna, a current flows through the cables even though there is an open circuit at the other end. This happens due to the transit time effect, wherein the signal changes more rapidly than the speed at which the signal travels. 2...

Thanks for the reply..I know TE modes propagate..What I meant was a TE wave that goes STRAIGHT through...so it essentially is a TEM wave with Electric field being transverse to the direction of propagation...

I have been wondering about the physical reason why a TE wave that goes STRAIGHT through the waveguide(without any reflections) can't propagate and would like some one to clarify the same OK..so if i consider a UNIFORM PLANE TE WAVE that goes straight thorough, then by definition of uniform...

Yea..so a static field will cause the electrons to move until a point is reached where it completely cancels out the external fields, so the net E field becomes zero. However, if the field were time varying, the electrons would have to keep moving in an attempt to cancel out the electric field...

forgive my ignorance, but how can a STATIC field produce a current in the first place?..All that i can decipher is that if the E field changes at a constant rate, the current through the conductor must be constant. If the tangential field is 0 only in the electrostatic case, why do we apply the...

There are some very basic questions about conductors that are bugging me: 1. I know that E=0 for a conductor is only if the fields remain static, If there was a time varying field, the electrons would be in constant motion across the conductor, meaning that at any point of time, a net tangential...

Is'nt it true?..if u could get a big hose then the swimming pool would fill up immediately..:rolleyes:

so very crudely speaking...its not a capacitor's fault that it does not allow a sharp change in voltage..it is essentially the inability of the source to provide an infinite current?...

'voltage generator will supply the infinite current necessary to get an abrupt change in the voltage across the capacitor'...could u pls elaborate on this?..and considering the most ideal situation, the waveform across a capacitor would show sharp peaks??...and if a resistor is connected in...

Capacitor---very basic questions Ive already gone through many posts on working of capacitors...but if i consider a very simple circuit...say i connect a function generator (which generates a sawtooth wave) across a capacitor...(no resistance in series)...and i measure voltage across the...

thanks!

Thanks a lot to everyone here..So from what i understand..radiation patterns are best done by the mathematical approach..that is, find current distribution, then the magnetic vector potential, followed by B and finally E..

I'll rephrase my question...All I wanted to know was whether it was possible to explain and/or predict the field pattern just by LOOKING at the voltage and current distributions (even if its approximate). I do understand the mathematical approach.

So there is no method to plot an approximate radiation pattern analytically?

I did go through the analysis of dipoles...which finally led to plotting of field patterns...I was just thinking if there was a completely analytical way to explain the same. Since we know the current and voltage distributions, i thought that the plotting of the field intensities could be...