iTeachChem•10mo ago

EMW

727OP•3/16/25, 5:09 PM

why are we using u=ε 0E^2/2 isnt net energy u=ε 0E^2

iTeachChem Helper•3/16/25, 5:09 PM

@Gyro Gearloose

iTeachChem Helper•3/16/25, 5:10 PM

Note for OP

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to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.

727OP•3/16/25, 5:10 PM

,rotate

TeXit•3/16/25, 5:10 PM

7727 why are we using u=ε 0E^2/2 isnt net energy u=ε 0E^2

Gamertug•3/16/25, 5:10 PM

wdym

727OP•3/16/25, 5:11 PM

emw net energy is u=ε 0E^2 na

7727 emw net energy is u=ε 0E^2 na

Gamertug•3/16/25, 5:11 PM

what

Gamertug•3/16/25, 5:11 PM

pretty sure its half that

GGamertug pretty sure its half that

727OP•3/16/25, 5:11 PM

why like its half that + magnetic field contribution

727OP•3/16/25, 5:12 PM

since they both are equal should it not be simply u=ε 0E^2

7727 why like its half that + magnetic field contribution

Gamertug•3/16/25, 5:12 PM

wait

Gamertug•3/16/25, 5:12 PM

hmm

7727 since they both are equal should it not be simply u=ε 0E^2

Gamertug•3/16/25, 5:13 PM

iirc U = e0E^2/2 = B^2/2u0

727OP•3/16/25, 5:13 PM

Gamertug•3/16/25, 5:14 PM

yes i am also a bit confused now

Gamertug•3/16/25, 5:14 PM

if someone answers ping me too

727OP•3/16/25, 5:14 PM

Ight

7727 Ight

Gamertug•3/16/25, 5:16 PM

i asked chat gpt and it also said it will be e0E^2

Gamertug•3/16/25, 5:16 PM

but cant guarantee it is right

727OP•3/16/25, 5:17 PM

but ans is using 1/2 wala formula

Gamertug•3/16/25, 5:17 PM

ye i also never thought abt it

trin•3/16/25, 5:35 PM

for reference go through example 8.5 of emwaves in old ncert

Ttrin for reference go through example 8.5 of emwaves in old ncert

727OP•3/16/25, 5:40 PM

han what i am asking is energy bola hai toh i should give net na like you have written I due to E is e0E^2/2

727OP•3/16/25, 5:41 PM

maybe i am not getting it can you like explain it if that is not the case

trin•3/16/25, 5:41 PM

energy contained in the cylinder is energy density

trin•3/16/25, 5:42 PM

wait

Ttrin energy contained in the cylinder is energy density

727OP•3/16/25, 5:42 PM

? its not

trin•3/16/25, 5:42 PM

lemme go thru the q

727OP•3/16/25, 5:42 PM

its that into volume

7727 han what i am asking is energy bola hai toh i should give net na like you have ...

trin•3/16/25, 5:47 PM

you use that and thats the energy of the wave right but you have to find the energy in the cylinder so you multiply it with volume

trin•3/16/25, 5:49 PM

are you asking why its 1/2 there

Ttrin you use that and thats the energy of the wave right but you have to find the ene...

727OP•3/16/25, 5:49 PM

bruh but my doubt is that net energy has equal contribution of magnetic and electric when you have written energy density due to E it's not net energy density na

Ttrin are you asking why its 1/2 there

727OP•3/16/25, 5:50 PM

yes

trin•3/16/25, 5:52 PM

got it

trin•3/16/25, 5:52 PM

one sec lemme write it down and send

7727 yes

trin•3/16/25, 6:06 PM

trin•3/16/25, 6:07 PM

do you get it rn?

trin•3/16/25, 6:08 PM

that sin function becomes variable hence we take the avg value

Ttrin Click to see attachment

727OP•3/16/25, 6:10 PM

ok i got it also can you resend the second pic it's illegible but point is clear from the 1st one

trin•3/16/25, 6:10 PM

one sec

trin•3/16/25, 6:11 PM

Ttrin that sin function becomes variable hence we take the avg value

727OP•3/16/25, 6:11 PM

ngl brought a tear to my eyes

Ttrin Click to see attachment

727OP•3/16/25, 6:11 PM

pouring honey over you my goat

trin•3/16/25, 6:11 PM

@Gamertug

727OP•3/16/25, 6:12 PM

ill close after they are done with it incase they find some issue

trin•3/16/25, 6:13 PM

okay and this is also explained in that image you sent of hcv, infact the same example is there as your q and there are similar examples/qs on this in the exercise so you can go thru that

Ttrin okay and this is also explained in that image you sent of hcv, infact the same e...

727OP•3/16/25, 6:14 PM

ok wow i got stun locked on the above portion i didn't see that

727OP•3/16/25, 6:14 PM

feeling hella dumb ngl

EMW

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