NEET Physics Current Electricity Questions Solved


Two wires of resistance R1 and R2 have temperature coefficient of resistance α1 and α2, respectively. These are joined in series. The effective temperature coefficient of resistance is 

(1) α1+α22

(2) α1α2

(3) α1R1+α2R2R1+R2

(4) R1R2α1α2R12+R22

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