A) \[2/9\]
B) \[9/2\]
C) \[2/7\]
D) \[7/2\]
Correct Answer: C
Solution :
Since there is no flow of heat in rod, so temperature of \[B\] is equal to temperature at \[A\,\,i.e.,\] \[{{\theta }_{B}}={{\theta }_{A}}={{20}^{o}}C\] Heat flowing through \[DB\] per second = heat flowing through \[BC\] per second \[i.e.,\] \[\frac{KA({{90}^{o}}-{{20}^{o}})}{{{I}_{BD}}}=\frac{KA({{20}^{o}}-{{0}^{o}})}{{{I}_{BC}}}\] \[\therefore \] \[\frac{{{I}_{BC}}}{{{I}_{BD}}}=\frac{2}{7}\]You need to login to perform this action.
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