3.4 Plane Waves

This video was made for a junior electromagnetics course in electrical engineering at Bucknell University, USA. The video is designed to be used as the out-of-the-classroom component and combined with active learning exercises in class. This video covers basics of plane waves, one of the most useful solutions to Maxwell's equations

[@gcinamaziya2174]

For the first time after more than ten years of taking the course I finally understand why the term “plane wave”. Thank you so much, you’re awesome!

[@jamesdiorio3369]

Thank heavens for someone who knows how to explain things intuitively, and is willing to record himself doing so.

[@condedennisful]

duuuude... you're so much better than my teacher!

[@dasilvaleandro21]

This is by far the best explanation I have seen. Really clears up how an electromagnetic plane wave looks like in space. It does not look like a rope, but rather more like layered surfaces each one with a constant value (magnitude and direction) of the electric field. Thanks a bunch!

[@tomr8779]

Fantastic video, thank you for making these concepts intuitive. Your teaching in conjunction with the applets makes it very clear.

[@linssendane]

this video is fantastic! taught me a lot. thank you!

[@shawnst7219]

Very helpful. So far the best explanation of plane waves.

[@ReasonableSwampMonster]

I’ve been trying to get an intuition for this since I learned acoustics 2 years ago and I finally got it thank you bro

[@Mulkek]

Awesome video! Thanks, and explain so clearly!

[@plavix221]

thank you so much for your explanation. Finally a explanation that is sufficient to my needs. Why dont we have footage in TV! educational aspect of TV is highly unused.

[@oussamareda414]

thanks for helping me I'm from Morocco it take me time to understand how waves to be plane

[@e.matsuo9838]

Magnífica explicación, me resultó muy útil :)

[@hrithuolickel]

Really good lecture. Cleared the concept for me.

[@PTNLemay]

Do the electric field lines always point in the same direction as K, or can you have a wave moving through space that are pointing in another (arbitrary) direction?

[@Graham_Wideman]

I like this video very much, but there's a bit of difficulty at 6:50. Suddenly, vector arrows appear attached to a couple of the peaks of the sine wave representing E magnitude. This is treating the E-magnitude graph line as having a position in space, which it does not have, and thus it's a bit of a distraction. Those E vectors should start on the z-axis and terminate on the sine wave magnitude line, like here: en.wikipedia.org/wiki/File:Onde_electromagnetique.svg And then to make matters more confusing, the example red and green plane segments, representing flat regions of interest in _spatial space,_ jump up and down tracking the sinusoidal graph of _E_ which is in the domain of E magnitude and direction.

[@theFitProfessor]

Good comment. I was about to do the same. Also, Eo is a constant vector, it should not vary from one wavefront to another plane to another. The exponential multiplies the E0 vector to give the E vector which seems to change parallel to the x-axis. But I may be wrong, the axe of oscillation also seems to be 45 degrees to the xy-axis and that would explain why he draw the vector at those angles.

[@buckcostanza3483]

thanks a thousand times!

[@AUAS]

First 4 minutes… just… thank you.

[@maishasam5553]

Thank you man your explanation is so clear..

[@prachisikarwar3567]

Thanks to you help the all engg students

[@rizwanulislam7521]

Sir does it mean that if one wave travels then it procuces electric field all around the space orthogonal to propagation

[@abcdef2069]

9:18 wish to see E and B plane waves both are present with any imagination, ok to plot them in extra boxes without overlapping, hope to see vectors in them

[@ShopperPlug]

excellent explanation

[@litiometalico]

How can I define the origin and the vector r. Can I define the origin anywhere? And r any position on space?

[@nimsarajayasinghe6933]

what was the book you mentioned at the beginning of the video?

[@brianestrada2259]

Bro, how do you graph a wavefront in matlab or mathematica?

[@yash1152]

11:11 dont "circular waves" mean same as circular polarised wave - which is altogether different from the spherical wave shown above??

[@abdelrahmangamalmahdy]

Why do we use E & H ? aren't we supposed to use E & B which stand for something physical ?!!! so the intrinsic impedance would then equal the speed of light.

[@ProjektKlover]

What's the differens between plane waves and longitudonal waves. Sound waves could also be seen as planes moving forward.

[@AsiaCrasie]

The animation helped a ton! Thank you!

[@poiuwnwang7109]

great lecture.

[@sample8289]

Isnt at 02:37 the equation not correct? It should be the real part of that phasor

[@ajais4]

Thank You. Video was very informative.

[@MrMikePaso]

wow, you sir are awesome, keep it up!

[@El650Jefe]

Didn’t he describe uniform plane waves here? Can’t you have plane waves where the amplitude of the wave is not constant over the wave fronts?

[@x9z6x]

Wow these videos are excellent. Would you be able to recommend a good electromagnetics book? I'm using Elements of Electromagnetics by Sadiku for my class.

[@meghjitmajumder3468]

how's the book sir bcz recently someone suggests me to buy it for solving problems?

[@jonathanhoftstrater8223]

@@meghjitmajumder3468 good one boy

[@mohamedelkony4780]

above amazing

[@jabbariqra6097]

Thanks sir

[@sandeepponnusamy7093]

For a wave, if the plane of all the points on the plane surface are the same it is called as plane wave.... I got it thanks

[@M.Malik5361]

@5:14 says' there is some constant value of E in space and it varies with space...' confusing??????

[@Graham_Wideman]

That was not very clear. He means that given a snapshot in time, all points on any particular xy plane are seeing the same E vector (E is constant across that xy plane), but move to a different plane and the value of E will be different, though again constant across that plane.

[@himvar007]

when electric field in x direction and magnetic field in y direction. how is it plane wave because if i move in y direction E is changing while definition of plane wave tells that it should be constant for this plane. please clear this doubt.

[@himvar007]

got it. basically equal vectors at any point in xy plane. vector direction is telling the polarization.

[@jonathanhoftstrater8223]

Then delete this

[@chhoragangakinarewala3847]

Cool bro

[@aslan-mehmet9940]

thanks

[@yash1152]

6:13 T I re-L "temporal varitation"

[@luqmansaleem894]

why don't they teach these things in class?

[@El-du7ml]

THANK YOUUUUU SIR . forever ;_;

[@ahmeddjekhar5442]

Always speaking about plane what plane