Questions
Two cylindrical conductor having same cross-sectional area ‘A’ and but lengths ‘l’ and ‘2l’ are connected in series combination. Temperature coefficient of resistivities of their materials are respectively. Then effective temperature coefficient of resistivity of the combination is
detailed solution
Correct option is C
(3)Re=R1+R2=α lA+2α.2lA=5 αlAAssuming , Re=αe. leA=αe.3lAαe 3lA=5 αlA αe = 5σ3Similar Questions
A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
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