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Four rods with different radii r and len...

Four rods with different radii `r` and length `l` are used to connect two reservoirs of heat at different temperatures. Which one will conduct most heat ?

A

`r=1cm`, `l=1m`

B

`r-2cm`,`l=2m`

C

`r=1cm`,`l=1//2m`

D

`r=2cm`, `l=1//2m`

Text Solution

Verified by Experts

`I prop (1)/(R )`
`Ruarr I darr`
Where `R=(l)/(KA)`
check for which option thermal resistance is least
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