JEE Main 2022 · 28 Jun · Shift 2 · Physics Q41

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PhysicsSingle correct+4 / -1Question 41 of 90

Resistance of the wire is measured as 2 $\Omega$ and 3 $\Omega$ at 10°C and 30°C respectively. Temperature co-efficient of resistance of the material of the wire is :

0.033 °C

^{-1}

-0.033

°C

^{-1}

0.011 °C

^{-1}

0.055 °C

^{-1}

Answer and worked solution

Official answer: A

$R=R_0(1+\alpha T)$ . $\dfrac{3}{2}=\dfrac{1+30\alpha}{1+10\alpha}$ gives $\alpha=\frac1{30}\approx0.033$ °C $^{-1}$ .

(A)

Topics:Temperature dependence of resistance

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JEE Main 2022 · 28 Jun · Shift 2, Physics question 41