Q 11-11-093JEE MainJEE Main 2023 (6 Apr, Shift 1)Easy
A source supplies heat to a system at the rate of $1000\ \text{W}$. If the system performs work at a rate of $200\ \text{W}$, the rate at which internal energy of the system increases is
Answer: (B) $800\ \text{W}$
$\dfrac{dU}{dt}=\dfrac{dQ}{dt}-\dfrac{dW}{dt}=1000-200=800\ \text{W}$.
Solution by Sreeraj P, M.Sc Physics