Question

81. The quantity of heat flowing for 10 seconds through a rod of length 40 cm, area 50 cm2 is 200 J. If the temperature difference at the ends of the rod is 80°C, then coefficient of thermal conductivity of the rod in Wm-'K-1 is
plz answer​

Answer 1

Explanation:

Q=200

A=50×10

−4

m

2

θ

1

=80

∘

C; θ

2

=0

t=10 s; l=0.40 m

Q=

L

KAΔTt

200=

0.4

K×50×10

−4

×80×10

K=20 W/mK