JEE Main 2009 Physics question
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 . The resistance of a wire changes from 100Ω to 150Ω when its temperature is increased from 27°C to 227°C. This implies that . Statement 2: is valid only when the change in the temperature is small and .
Solution
Statement 2 is true: using the resistance at an arbitrary initial temperature as the reference, holds only approximately, for small changes. In Statement 1 the change is large (ΔR = 50 Ω, half of 100 Ω), so the value is not
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