Class 12 Physics
CBSE and UP Board
Current Electricity
NCERT Solutions for Class 12 Physics Chapter 3
Exercise 3
Chapter-3 Exercise 3.7
A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature coefficient of resistivity of silver.
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Temperature, T₁ = 27.5°C
Resistance of the silver wire at T₁, R₁ = 2.1 Ω
Temperature, T2 = 100°C
Resistance of the silver wire at T2, R2 = 2.7 Ω
Temperature coefficient of silver = α
It is related with temperature and resistance as
α =(R2-R₁)/R ₁(T2-T₁)
= (2.7 -2.1 ) /2.1 (100 -27.5) = 0.0039 °C⁻¹
Therefore, the temperature coefficient of silver is 0.0039°C⁻¹.