10-2.Transmission of Heat
medium

आरेख में दर्शाए अनुसार दो कुचालक शीटों, जिनके तापीय प्रतिरोध $R _{1}$ और $R _{2}$ तथा शीर्ष और तली के ताप $\theta_{1}$ तथा $\theta_{2}$ हैं, की संधि का ताप $\theta$ होगा।

A

$\frac{\theta_{1} R_{1}+\theta_{2} R_{2}}{R_{1}+R_{2}}$

B

$\frac{\theta_{1} R _{2}-\theta_{2} R _{1}}{ R _{2}- R _{1}}$

C

$\frac{\theta_{1} R _{2}+\theta_{2} R _{1}}{ R _{1}+ R _{2}}$

D

$\frac{\theta_{1} R_{1}+\theta_{2} R_{2}}{R_{1}+R_{2}}$

(JEE MAIN-2021)

Solution

Heat flow rate will be same through both

$\therefore \frac{\theta_{1}-\theta}{ R _{1}}=\frac{\theta-\theta_{2}}{ R _{2}}$

$R _{2} \theta_{1}- R _{2} \theta= R _{1} \theta- R _{1} \theta_{2}$

$\theta=\frac{ R _{2} \theta_{1}+ R _{1} \theta_{2}}{ R _{1}+ R _{2}}$

Standard 11
Physics

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