Current Electricity Ques 106 — JEE PYQ Chapterwise

  1. 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:

Electrical Power:

  1. $W=0$. 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 $(d)$.

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