A) \[{{400}^{\text{o}}}C\]
B) \[{{450}^{\text{o}}}C\]
C) \[{{500}^{\text{o}}}C\]
D) \[{{550}^{\text{o}}}C\]
Correct Answer: C
Solution :
From definition of temperature resistance coefficient \[{{R}_{t}}={{R}_{0}}(1+\alpha t)\] \[3{{R}_{0}}={{R}_{0}}(1+4\times {{10}^{-3}}t)\] \[3=1+4\times {{10}^{-3}}t\] \[4\times {{10}^{-3}}t=2\] \[t=\frac{2}{4\times {{10}^{-3}}}\] \[={{500}^{o}}C\]You need to login to perform this action.
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