The temperature at which resistance of conductors becomes double to its resistance at 0°C is

The temperature at which resistance of conductors becomes double to its resistance at 0°C is:

1. 1/α₀ °C
2. 3/α₀ °C
3. 1/(1+ α₀) °C
4. α₀ °C

Correct answer: 1. 1/α₀ °C

Explanation

R_t= R₀ (1+ α₀ t)

Here it is known that

R_t= 2.R₀

2R₀= R₀ (1+ α₀ t)

Or t = 1/α₀°C