MCQ
The efficiency of an engine working between temperatures $T _1$ and $T _2$ is :
- A$\left(1-\frac{T_1}{T_2}\right)$
- ✓$\left(1-\frac{T_2}{T_1}\right)$
- C$\left(\frac{T_1}{T_2}-1\right)$
- D$\left(\frac{T_1-T_2}{T_2}\right)$
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In the experiment $I$ : a copper rod is used and all ice melts in $20$ minutes.
In the experiment $II$ : a steel rod of identical dimensions is used and all ice melts in $80$ minutes.
In the experiment $III$ : both the rods are used in series and all ice melts in $t_{10}$ minutes.
In the experiment $IV$ : both rods are used in parallel and all ice melts in $t_{20}$ minutes.