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One end of conducting rod is maintained ...

One end of conducting rod is maintained at temperature `50^(@)C` and at the other end ice is melting at `0^(@)C`. The rate of melting of ice is doubled if:

A

The temperature is made 200°C and the area of cross-section of the rod is doubled

B

The temperature is made 100°C and length of the rod is made four times

C

Area of cross-section of rod is halved and length is doubled

D

The temperature is made 100°C and area of cross-section of rod and length both are doubled

Text Solution

Verified by Experts

The correct Answer is:
D
`H=(KADeltaT)/(l)=(KA(50))/(l)` In option (D) `H'=(k(2A)100)/(k(2l))=(2xxKA(50))/(l)`
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