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Three identical conducting rods are conn...

Three identical conducting rods are connected as shown in figure. Given that `theta_a = 40^@C`, `theta_c = 30^@C` and `theta_d = 20^@C`. Choose the correct option.

A

temperature of junction b is `15^@C`.

B

temperature of junction b is `30^@C`

C

heat will flow from b to d

D

both (b) and (c)

Text Solution

Verified by Experts

The correct Answer is:
D

`H_1 = H_2 + H_3`
`:. (40-theta)/R = (theta -20)/R + (theta -30)/R`
where, R = thermal resistance of each rod
Solving this equation, we get
`theta = 30^@C`
Heat flows from higher temperature to lower temperature.
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