196- A copper rod of length $50\,\text{cm}$ and cross-sectional area $5\,\text{cm}^2$. One end of this rod is at a constant temperature of $80^\circ\text{C}$ and the other end is at $30^\circ\text{C}$ and is insulated and connected to a block. Under steady-state conditions, the rate of heat flow through the rod is harmonious. How many joules per second and how many degrees Celsius is the temperature of the end block? $$\left(k = 400\,\frac{\text{W}}{\text{m.K}}\right)$$ (1) $40$ and $20$ (2) $70$ and $30$ (3) $40$ and $50$ (4) $70$ and $50$
\textbf{196-} A copper rod of length $50\,\text{cm}$ and cross-sectional area $5\,\text{cm}^2$. One end of this rod is at a constant temperature of $80^\circ\text{C}$ and the other end is at $30^\circ\text{C}$ and is insulated and connected to a block. Under steady-state conditions, the rate of heat flow through the rod is harmonious. How many joules per second and how many degrees Celsius is the temperature of the end block?
$$\left(k = 400\,\frac{\text{W}}{\text{m.K}}\right)$$
(1) $40$ and $20$ \hfill (2) $70$ and $30$ \hfill (3) $40$ and $50$ \hfill (4) $70$ and $50$
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