A) \[550{}^\circ C\]
B) \[500{}^\circ C\]
C) \[450{}^\circ C\]
D) \[400{}^\circ C\]
Correct Answer: B
Solution :
[b] \[{{R}_{t}}={{R}_{0}}\left( 1+\alpha t \right)\] at \[t{}^\circ C\]\[{{R}_{t}}=3{{R}_{0}}\] \[\alpha =4\times {{10}^{-3}}/{}^\circ C\] \[3{{R}_{0}}={{R}_{0}}\left( 1+4\times {{10}^{-3}}\times t \right)\] \[\therefore \,\,\,\,\,\,3-1=4\times {{10}^{-3}}\times t\] \[\therefore \,\,\,\,t=\frac{2}{4\times {{10}^{-3}}}=500{}^\circ C\]
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