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Question

Two metallic slabs of same area of cross section and length having thermal conductivities 300 W/mC and 200 W/mC respectively are connected in series combination. Find the equivalent thermal conductivity (in W/mC)

A
240
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B
360
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C
250
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D
275
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Solution

The correct option is A 240
Given , A1=A2, l1=l2
Thermal conductivity of slab 1 (k1)=300 W/mC
Thermal conductivity of slab 2 (k2)=200 W/mC
Equivalent thermal condictivity (keq)=2k1k2k1+k2
=2×200×300500
=12005=240 W/mC

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