Three rods AB - BC and AC having thermal resistances of 10 units- 10 units and 20 units- respectively- are connected as shown in the figure- Ends A and C are maintained at constant temperatures of 100- C and 0- C- respectively- The rate at which the heat is crossing junction B is-A- 5 unitsB- 10 unitsC- 20 unitsD- 7-5 units

The correct option is A 5 units ⇒ R_eq=20 dH/dt=100/20=5 units ...

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Byju's Answer

Standard XII

Physics

Thermal Resistance

Three rods AB...

Question

Three rods AB, BC and AC having thermal resistances of 10 units, 10 units and 20 units, respectively, are connected as shown in the ﬁgure. Ends A and C are maintained at constant temperatures of $100^{\circ} C$ and $0^{\circ} C$ , respectively. The rate at which the heat is crossing junction B is:

5 units

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10 units

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20 units

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7.5 units

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Solution

The correct option is A 5 units

$\Rightarrow R_{e q} = 20 \frac{d H}{d t} = \frac{100}{20} = 5 u n i t s$

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Three rods AB, BC and AC having thermal resistances of 10 units, 10 units and 20 units, respectively, are connected as shown in the ﬁgure. Ends A and C are maintained at constant temperatures of 100∘C and 0∘C, respectively. The rate at which the heat is crossing junction B is:

The correct option is A 5 units ⇒Req=20dHdt=10020=5 units

The correct option is A 5 units

$\Rightarrow R_{e q} = 20 \frac{d H}{d t} = \frac{100}{20} = 5 u n i t s$