The temperature gradient in a rod of `0.5 m` length is `80^(@)C//m`. It the temperature of hotter end of the rod is `30^(@)C`, then the temperature of the cooler end is
A. `40^(@)C`
B. `-10^(@)C`
C. `10^(@)C`
D. `0^(@)C`
A. `40^(@)C`
B. `-10^(@)C`
C. `10^(@)C`
D. `0^(@)C`
Correct Answer – B