Question

Q.7
A rod is of 40 cm in length and has a temperature difference of 80oC at its two ends. Another rod B is of length 60 cm and has a temperature difference 90oC, but has the same area of cross section. If the rate of flow of heat is the same then the ratio of their thermal conductivities will be

1)
2:1

2)
3:4

3)
1:2

4)
4:3

Answer 1

Answer:

Correct answer is 3:4

Explanation:

See the attachment.