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Physics · PYQ NEET UG 2023
हिन्दीThe resistance of platinum wire at \( 0^\circ\text{C} \) is \( 2\text{ }\Omega \) and \( 6.8\text{ }\Omega \) at \( 80^\circ\text{C} \). The temperature coefficient of resistance of the wire is :
Correct answer · Option 4
\( 3 \times 10^{-2}\text{ }^\circ\text{C}^{-1} \)
Explanation
Temperature coefficient \( \alpha = \frac{R_2 - R_1}{R_0 (T_2 - T_1)} = \frac{6.8 - 2}{2 \times (80 - 0)} = \frac{4.8}{160} = 0.03 = 3 \times 10^{-2}\text{ }^\circ\text{C}^{-1} \).
