The area of the glass of a window of a room is $10\;{m^2}$ and thickness $2mm$. The outer and inner temperature are ${40^o}C$ and ${20^o}C$ respectively. Thermal conductivity of glass in $MKS$ system is $0.2$. The heat flowing in the room per second will be
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(b) $\frac{Q}{t} = \frac{{KA({\theta _1} - {\theta _2})}}{l} = \frac{{0.2 \times 10 \times 20}}{{2 \times {{10}^{ - 3}}}} = 2 \times {10^4}J/\sec $
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