Question

One end of a conducting rod is maintained at temperature 50⁰C and at the other end ice is melting at 0⁰C. The rate of melting of ice is doubled if –

• A. The temperature is made 200⁰C and the area of cross-section of rod is doubled
• B. The temperature is made 100⁰C 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 100⁰C and area of cross-section of rod and length both are doubled.

Answer 1

Answer: (D)

The temperature is made 100⁰C and area of cross-section of rod and length both are doubled.

Answer 2

$\frac{\Delta Q}{\Delta t}$ µ $\frac{A(\Delta T)}{\mathcal{l}}$

If A is double the rate of flow of heat is double.