What is the temperature of the steel-copper junction in the steady-state of the system shown in the figure?

The length of the steel rod = 15.0 cm, length of the copper rod = 10.0 cm, temperature of the furnace = 300 °C, temperature of the other end = 0 °C. The area of the cross section of the steel rod is twice that of the copper rod.

(Thermal conductivity of steel = ; and of copper = ).

1.

2.

3.

4.

Subtopic:  Conduction |
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An iron bar $$\left(L_{1} = 0 . 1 m , A_{1} = 0 . 02 m^{2} , K_{1} = 79 W m^{- 1} K^{- 1}\right)$$ and a brass bar $$\left(L_{2} = 0 . 1 m , A_{2} = 0 . 02 m^{2} , K_{2} = 109 W m^{- 1} K^{- 1}\right)$$ are soldered end to end as shown in the figure. The free ends of the iron bar and brass bar are maintained at 373 K and 273 K respectively. The temperature of the junction of the two bars is:

1.  215 K

2. 315 K

3. 415 K

4.115 K

Subtopic:  Conduction |
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An iron bar  and a brass bar  are soldered end to end as shown in the figure. The free ends of the iron bar and brass bar are maintained at 373 K and 273 K respectively and the  The equivalent thermal conductivity of the compound bar is:

1.

2.

3.

4.

Subtopic:  Conduction |
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An iron bar $$\left(L_{1} = 0 . 1 m , A_{1} 0 . 02 m^{2} , K_{1} = 79 W m^{- 1} K^{- 1}\right)$$ and a brass bar $$\left(L_{2} = 0 . 1 m , A_{2} = 0 . 02 m^{2} , K_{2} = 109 W m^{- 1} K^{- 1}\right)$$ are soldered end to end as shown in the figure. The free ends of the iron bar and brass bar are maintained at 373 K and 273 K respectively. The heat current through the compound bar is:

1.  916.1 W

2.  826.1 W

3.  926.1 W

4.  726 W

Subtopic:  Conduction |
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