Two metal wires of identical dimension are connected in series. If σ 1 and σ 2 are the conductivities of the metal wires respectively, the effective conductivity of the combination is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Let length of wire be 'l'
Area of wire as 'A'
For equivalent wire length 
area will be A
Thermal resistance
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