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# Statement-1 : The temperature dependence of resistance is usually given as $Question: Statement-1 : The temperature dependence of resistance is usually given as$\mathrm{R}=\mathrm{R}_{0}(1+\alpha \Delta \mathrm{t})$. The resistance of a wire changes from$100 \Omega$to$150 \Omega$when its temperature is increased from$27^{\circ} \mathrm{C}$to$227^{\circ} \mathrm{C}$. This implies that$\alpha=2.5 \times 10^{-3} /{ }^{\circ} \mathrm{C}$. Statement$-2: R=R_{0}(1+\alpha \Delta t)$is valid only when the change in the temperature$\Delta \mathrm{T}$is small and$\Delta \mathrm{R}=\left(\mathrm{R}-\mathrm{R}_{0}\right) \ll \mathrm{R}_{0}$. 1. Statement$-1$is true, Statement$-2$is true; Statement$-2$is not the correct explanation of Statement$-1$2. Statement-1 is false, Statement$-2$is true 3. Statement-1 is true, Statement-2 is false 4. Statement$-1$is true, Statement$-2$is true; Statement$-2$is the correct explanation of Statement$-1\$

Correct Option: 1

Solution:

Solution is not required