A) 12.6 min
B) 12.8 min
C) 6.3 min
D) 6.4 min
Correct Answer: C
Solution :
Heat required, \[Q=1000\times 1\times (100-20)\] \[=1000\times 80\]cal Heat produced in time t is, \[H=Vlt\] \[=220\times 4\times t\,\,J=\frac{220\times 4\times t}{4.18}cal\] \[\therefore \] \[=\frac{220\times 4\times t}{4.18}=100\times 80\] \[\Rightarrow \] \[t=\frac{1000\times 80}{4.18\times 220\times 4}=6.3\,\min \]
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