Questions
In a composite rod, when two rods of different lengths and of the same area of cross-section are joined end to end, then if K is the effective coefficient of thermal conductivity,
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a
I1K1−I2K2
b
I1K2−I2K1
c
I1K1+I2K2
d
I1K2×I2K1
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Correct option is C
R=R1+R2 ∵ Thermal Resistance R=LkA L1+L2kA=L1k1A+L2k2A ⇒L1+L2k=L1k1+L2k2Similar Questions
Water can be heated in a cup of paper because:
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