One end of a conducting rod is maintained at temperature \( 50^{\circ} \mathrm{C} \) and at the ...

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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 s doubled if :
(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 the rod is made of four times
(C) Area of cross section of rod is halved and length is doubled
(D) The temperature is made \( 100^{\circ} \mathrm{C} \) and area of cross-section of rod and length both are doubled
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