As per the given figure, two plates A and B of thermal conductivity K and 2 K are joined together to form a compound plate. The thickness of plates are 4.0 cm and 2.5 cm respectively and the area of cross-section is 120 cm 2 for each plate. The equivalent thermal conductivity of the compound plate is 
, then the value of 
will be ______ .
Text Solution
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(21)
Sol.
R: Thermal resistivity
Now, R eq of this series combination
R eq = R 1 + R 2
where L eq = 4 + 2.5 = 6.5
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