A rate of heat flow of \( 2000 \mathrm{~J} / \mathrm{s} \) is to be...

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A rate of heat flow of \( 2000 \mathrm{~J} / \mathrm{s} \) is to be passed through
P a copper rod of length \( 10 \mathrm{~cm} \) and area of cross section
\( \mathrm{W} \) \( 100 \mathrm{~cm}^{2} \). The thermal conductivity of copper is 200 \( \mathrm{W} / \mathrm{m}^{\circ} \mathrm{C} \). The two ends of this rod must be kept at a temperature difference of
(1) \( 1^{\circ} \mathrm{C} \)
(2) \( 10^{\circ} \mathrm{C} \)
(3) \( 100^{\circ} \mathrm{C} \)
(4) \( 1000^{\circ} \mathrm{C} \)
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