Question

A metal rod of length 20cm and diameter 2cm is covered with a non-conducting substance. One of it ends is maintained at 100⁰c while the other is at 0⁰c. It is found that 25g of ice melts in 5 min calculate coefficient of thermal conductivity of metal?

Answer 1

Length of rod = ∆x = 20cm = 2 × 10^-3m

Diameter = 2cm 

R = 10^-2m 

Area of cross-section = π r²  

= π (10^-2)² 

K = coefficient of thermal conductivity