NEET Questions Solved


If two metallic plates of equal thicknesses and thermal conductivities K1 and K2 are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

(a) K1K2K1+K2                     (b) 2K1K2K1+K2
(c) K12+K223/2K1K2              (d) K12+K223/22K1K2

(b) In series 

Req=R1+R22lKeqA=lK1A+lK2A2Keq=1K1+1K2Keq=2K1K2K1+K2

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