One end of a conducting rod is maintained at temperature \( 50^{\ci...

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One end of a conducting rod is maintained at temperature \( 50^{\circ} \mathrm{C} \) and at the other end, ice is melting at \( 0^{\circ} \mathrm{C} \). The rate of melting of ice is doubled if:
\( \mathrm{P} \)
(A) the temperature is made \( 200^{\circ} \mathrm{C} \) and the area of cross-section of the rod is doubled
(B) the temperature is made \( 100^{\circ} \mathrm{C} \) and length of rod is made four times
W
(C) area of cross-section of rod is halved and length is doubled
(D) the temperature is made \( 100^{\circ} \mathrm{C} \) and the area of cross-section of rod and length both are doubled.
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