An electric heater is sandwiched between two plates each 0.3 m long and 0.1 m wide with a thickness of 30 mm. At steady-state condition, the heater is maintained at a temperature of 100°C, with a current of 0.25 A and voltage of 200 V. Assume the plates are perfectly insulated at the edges, and the heater is having perfect contact with the plates to give a temperature of 50°C on the outside of the plate surface. What is the thermal conductivity of the plate material?

An electric heater is sandwiched between two plates each 0.3 m long an

1.	An electric heater is sandwiched between two plates each 0.3 m long and 0.1 m wide with a thickness of 30 mm. At steady-state condition, the heater is maintained at a temperature of 100°C, with a current of 0.25 A and voltage of 200 V. Assume the plates are perfectly insulated at the edges, and the heater is having perfect contact with the plates to give a temperature of 50°C on the outside of the plate surface. What is the thermal conductivity of the plate material?
A.	1.0 W/m-K
B.	0.5 W/m-K
C.	0.015 W/m-k
D.	0.3 W/m-K
Answer» C. 0.015 W/m-k

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