A) \[400{}^\circ C\]
B) \[225{}^\circ C\]
C) \[450{}^\circ C\]
D) \[30{}^\circ C\]
Correct Answer: B
Solution :
As, \[\operatorname{E}=30\,\,\theta -\frac{{{\theta }^{2}}}{15}\] For neutral temperature, \[\frac{dE}{d\theta }=0\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\frac{dE}{d\theta }=30-\frac{2\,\,\theta }{15}=0\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,30=\frac{2\,\theta }{15}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\theta =\frac{15\times 30}{2}\,\,=\,\,225{}^\circ C\]You need to login to perform this action.
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