thermal conduction

how to solve this . i designed the question on my own inspired from infinite resistors ladder problems. consider lower rods to be highly conductive . i.e zero thermal resistance (like a wire in circuit)
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34 Replies
iTeachChem Helper
iTeachChem Helper•7d ago
@Dexter
iTeachChem Helper
iTeachChem Helper•7d ago
Note for OP
+solved @user1 @user2... 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.
hardcoreisdead
hardcoreisdeadOP•7d ago
@Moderator pls ping phy one
flower
flower•7d ago
@Gyro Gearloose
hardcoreisdead
hardcoreisdeadOP•7d ago
i have solved infinite ladder with same repeating units but here the resistance is decreasing continuously by a factor of 2 we can do that damn
trin
trin•7d ago
no, hes a mod lol
hardcoreisdead
hardcoreisdeadOP•7d ago
oh lol
flower
flower•7d ago
me fr ;-; this is just sad anyways i have no idea how to do this seems very intresting tho solution mile to ping karna please @hardcoreisdead
Nimboi
Nimboi•7d ago
so here the repeating unit, instead of being R, would be R/2 right actually wait lol i = V/R, and R = l/KA i.e. i proportional to K, which just keeps increasing here i think you've made an infinite current setup
hardcoreisdead
hardcoreisdeadOP•7d ago
not exactly infinite ladder ye lowkey true 💀
Nimboi
Nimboi•7d ago
no like the question you've made you asked for net heat flow instead of equivalent resistance right
hardcoreisdead
hardcoreisdeadOP•7d ago
yeah that deltaT/thermal resistance
Nimboi
Nimboi•7d ago
oh im tripping wait lemme actually use pen and paper
hardcoreisdead
hardcoreisdeadOP•7d ago
so in short u have to solve infinite ladder only
Nimboi
Nimboi•7d ago
this isnt the same method as infinite ladder this doesnt have a repeating unit, just a pattern
hardcoreisdead
hardcoreisdeadOP•7d ago
yeah it looks like infinite ladder but it isnt really
Tanish
Tanish•7d ago
neeche waali rods bhi k 2k 4k 8k..... follow kar rahi hain kya?
hardcoreisdead
hardcoreisdeadOP•7d ago
forgot to mention... consider lower rods to be highly conductive . i.e zero thermal resistance (like a wire in circuit)
Tanish
Tanish•7d ago
wouldn't the majority of the heat will flow through the lower rods then? heat current should become infinite
Opt
Opt•7d ago
Infinite na? Series diverges
nermal
nermal•7d ago
@ᴘɪᴄᴄʜɪ | 🎧 🎶 pls? look into that error we are getting rate limited must be some function which sends requests every second tbh
SirLancelotDuLac
SirLancelotDuLac•7d ago
Lower rod conductivity is k,2k,4k...?
SirLancelotDuLac
SirLancelotDuLac•7d ago
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Opt
Opt•7d ago
What is your basis for considering that the rest will be x/2?
SirLancelotDuLac
SirLancelotDuLac•7d ago
We are scaling all resistances to half their value. Also, I considered T1 and T2 at upper and lower rod otherwise the result diverges. If purely conducting rods are used, same approach to find the value ig.
hardcoreisdead
hardcoreisdeadOP•7d ago
they have high conductivity so zero thermal resistance this tho. pls clarify this
SirLancelotDuLac
SirLancelotDuLac•7d ago
If you consider the point at T2 to be at infinity, converting to the electrical analogy, you can see the points are short circuited due to them being connected by conducting wires, hence effective current tends to infinity. Ah, then same proceedure, just the lower portion as conducting wires.
hardcoreisdead
hardcoreisdeadOP•7d ago
i was inspired from this problem
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hardcoreisdead
hardcoreisdeadOP•7d ago
problem is in my question the resistance is getting halved . so idk the answer...
Tanish
Tanish•7d ago
Isme starting ke dono ends different potential pe honge Na
SirLancelotDuLac
SirLancelotDuLac•7d ago
This is what is done here. (Approach for both will be the same)
hardcoreisdead
hardcoreisdeadOP•7d ago
i dont understand r/2 wala thing here r is net resistance or resistance of that resistor
SirLancelotDuLac
SirLancelotDuLac•7d ago
Let the net resistance of the entiire thing be x. Now you are scaling down each resistor by a factor by 2. So the effective resistance of the entire portion after the verticle r/2 resistance is x, but scaled down by 2. (r=L/k.A) Then you get the above setup hence answer.

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