Two metallic slabs of same area of cross section and length having thermal conductivities 300W/m∘C and 200W/m∘C respectively are connected in series combination. Find the equivalent thermal conductivity (in W/m∘C)
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 A240 Given , A1=A2,l1=l2 Thermal conductivity of slab 1 (k1)=300W/m∘C Thermal conductivity of slab 2 (k2)=200W/m∘C Equivalent thermal condictivity (keq)=2k1k2k1+k2 =2×200×300500 =12005=240W/m∘C