The walls of a closed cubical box of edge 
are made of material of thickness 
and thermal conductivity, 
. The interior of the box is maintained 
above the outside temperature by a heater placed inside the box and connected across 
DC supply. The resistance of the heater is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Given side of cube, 
.
area of cube 
(area of one sid eof the cube) 
thickness 
Temperature difference, 
Rate of neat transfer through conduction wall is given by
Power, 
Given, voltage of DC supply, V 
Power, 
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