First slide

Conduction

Question

Two metallic rods are connected in series. Both are of same material, of same length and same area of cross-section. If the conductivity of each rod be K, then what will be the conductivity of the combination ?

Moderate

A

4 K
B

2 K
C

K
D

K/2

Solution

Conductivity is the property of the material Thermal resistance $R_{s} = R_{1} + R_{2}$
or $2 l / K^{'} A = l / KA + l / KA$
or $K^{'} = K$

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