A) \[45{}^\circ \,C\]
B) \[75{}^\circ C\]
C) \[35{}^\circ C\]
D) \[60{}^\circ C\]
Correct Answer: A
Solution :
\[{{T}_{A}}\,\,-\,\,{{T}_{B}}\,\,=\,\,120{}^\circ C\] \[{{T}_{P}}-{{T}_{Q}}\,\,=\,\,?\] \[\because \,\,{{R}_{th}}\,\,=\,\,\frac{1}{K}\,\,\,\frac{L}{A}\] \[\because \,\,\,\,{{R}_{th}}\,\,=\,\,\frac{1}{K\,A}\,\,\,\left( \frac{L}{4} \right)\,\,=\,\,\,R\,\,(Let\,\,us\,\,say)\] \[{{(Red.)}_{AB}}\,=\,6.4\,\,R\] \[{{1}_{th}}\,=\,\,\frac{120}{6.4\,R};\,\,\,\,\,\,\,\,\,\,\,{{V}_{PQ}}\,\,=\,\,\frac{6\,R}{10\,R}\,.\,\frac{120\,R}{6.4\,R}\,\,=\,\,\frac{72}{6.4\,R}\] \[45{}^\circ C\]You need to login to perform this action.
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