KCET2024PhysicsCurrent Electricity
The I-V graph for a conductor at two different temperatures 100^ C and 400^ C is as shown in the figure. The temperature coefficient of resistance of the conductor is about (in per degree Celsius)
Options
- A3 10⁻⁵
- B8 10⁻³
- C9 10⁻³
- D12 10⁻³
Correct answer
A. 3 10⁻⁵
Step-by-step solution
From the I-V graph, Resistance of first conductor, R₁= 1 45^ =1 Resistance of second conductor, R₂= 1 30^ = 3 Temperature coefficient of resistance of the conductor. = R₂-R₁ R₁ t₂-R₂ t₁ = 3-1 1 400- 3 100 =3.22 10⁻³ C =3 10⁻³ / ^ C