This question contains Statement-1 and Statement-2. Of the four choices given after the statements?

Question

This question contains Statement-1 and Statement-2. Of the four choices given after the statements?

This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.

Statement-1: The temperature dependence of resistance is usually given as R = R₀(1 + αΔt). The resistance of a wire changes from 100Ω to 150Ω when its temperature is increased from 27°C to 227°C. This implies that a = 2.5 × 10^–3/°C

Statement-2: R = R₀(1 + αΔt) is valid only when the change in the temperature ΔT is small and ΔR = (R – R₀) << R₀.

(a) Statement-1 is true, Statement-2 is false

(b) Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.

(c) Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.

(d) Statement-1 is false, Statement-2 is true

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Salim Ahmed Kawsar · Answer 1 · Feb 05, 2023 15:29:48

(a) : From the statement given, a = 2.5 × 10^–3/°C. The resistance of a wire change from 100Ω to 150Ω when the temperature is increased from 27°C to 227°C.
It is true that a is small. But (150 – 100)Ω or 50Ω is not very much less than 100Ω i.e., R – R₀ << R₀is not true.

This question contains Statement-1 and Statement-2. Of the four choices given after the statements?

1 Answers