NEET Physics Current Electricity Questions Solved

Two resistances R1 and R2 are made of different materials. The temperature coefficient of the material of R1 is α and of the material of R2 is –β. The resistance of the series combination of R1 and R2 will not change with temperature, if R1/ R2 equals 

(1) αβ

(2) α+βαβ

(3) α2+β2αβ

(4) βα

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