Current Electricity Ques 106
- A rigid container with thermally insulated walls contains a coil of resistance $100$ $ \Omega$, carrying current $1 $ $A$. Change in internal energy after $5$ min will be
(a) zero
(b) $10 $ $kJ$
(c) $20 $ $kJ$
(d) $30$ $ kJ$
$(2005,2 M)$
Show Answer
Answer:
Correct Answer: 106.(d)
Solution:
Formula:
- $W=0$. Therefore, from first law of thermodynamics,
$ \Delta U=\Delta Q=i^{2} R t=(1)^{2}(100)(5 \times 60) J=30$ $ kJ . $
$\therefore$ Correct answer is $(d)$.
BETA
