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The resistance R0 and Rt of a metallic wire at temperature 0° C and t° C are related as (a is the temperature co-efficient of resistance).

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The resistance R0 and Rt of a metallic wire at temperature 0° C and t° C are related as (a is the temperature co-efficient of resistance).

(a) Rt = R0 (1 + αt) 

(b) Rt = R0 (1 – αt) 

(c) Rt = R0 (1 + αt)2

(d) Rt = R0 (1 – αt)2

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(a) Rt = R0 (1 + αt)

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