Two metal wires of identical dimensions are connected in series. If 
and 
and are the conductivities of the metals respectively, the effective conductivity of the combination is
Text Solution
Verified by ExpertsThe correct answer is:
D
Resistance of a wire in terms of conductivity 
is given by
where l is the length and A is the area of cross – section of wire respectively.
As the wires are connected in series,
where 
is the effective conductivity
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