Home
Class 12
PHYSICS
The walls of a closed cubical box of edg...

The walls of a closed cubical box of edge` 40 cm` are made of a material of thickness `1 mm` and thermal conductivity `4 xx 10^(-4) cals^(-1@) C^(-1)`. The interior of the box is maintained at `100 ^(@) C` above the outside temperature by a heater placed inside the box and connected across `400 V dc` . Calculate the resistance of the heater.

Promotional Banner

Similar Questions

Explore conceptually related problems

The walls of a closed cubical box of edge 50cm are mdade of a material of thickness 1mm and thermal conductivity 4xx10^(-4) cal s^(-1)cm^(-1).^(@)C^(-1) the interior of the box maintained at 100^(@)C above the outside temperature by a heater placed inside the box and connected acros a 400 V d.c. source. Calculate the resistance of the heater.

The walls of a closed cubical box of edge 60 cm are made of material of thickness 1 mm and thermal conductivity, 4 xx 10^(-4)" cal " s^(-1) cm ^(-1 @) C^(-1) The interior of the box is maintained 1000^(@)C above the outside temperature by a heater placed inside the box and connected across 400 V DC supply. The resistance of the heater is

The walls of a closed cubical box of edge 50cm are made of a material of thickness 1mm and thermal conductivity 4xx10^(-4) cm^(-1)(.^@C)^(-1) . The interior of the box is maintained 100^(@)C above the outside temperature by a heater placed inside the box and connected across 420V d.c. calculate the resistance of copper.

The walls of a closed cubical box of edge 5 cm are of a material of thermal conductivity 4 xx 10^-4 cal s^-1 cm^-1 C^-1 and thickness 1 mm. The interior is maintained at 100^@C above the outside temperature by a heater placed inside the box and connected across a 400 V d.c. source. The resistance of the heater is

Steam at 100^(@)C is passed through a tubeof radius 5 cm and length 3 m. If the thickness of tube be 2 mm and conductivity of its material be 2xx10^(-4)" cal "cm^(-1) K^(-1) s^(-1) , calculate the rate of loss of heat in js^(-1) . The outside temperature is 20^(@)C .

A cube of side 10cm is filled with ice of density 0.9//c.c Thickness of the walls of the cube is 1mm and thermal conductivity of the material of the cube is steam bath maintained at a placed in steam bath maintained at a temperature of 100^(@)C the time in which ice completely melts is (L_(ice)=80cal//gm) .

A 100 W heater is placed in a cubical container of edge length 6xx10^(-2)m. The wall thick ness of the container is 1 mm. If inside and outside temperature in steady state are 30^(@)C. and 25^(@)C, find the thermal conductivity of the material of the box.

An insulating wall consists of 4cm of material of thermal conductivity K_1 and a second layer of 8 cm thickness whose conductivity K_2 = 4K_1 . The innermost and outermost surfaces are kept at -10^@ C and 76^@ C respectively. Calculate the temperature at the interface.