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CGPET 2022 Solved Paper
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Section:
Physics
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© examsnet.com
Question : 38
Total: 150
Three conducting rods of same material and cross-section are shown in figure. Temperature of
A
,
D
and
C
are maintained at
20
∘
C
,
90
∘
C
and
0
∘
C
, respectively. The ratio of the lengths of
B
C
and
B
D
, if there is no flow in
A
B
is
‌
2
9
‌
9
2
‌
2
7
‌
7
2
Validate
Solution:
As there is no heat flow in
AB
this means junction
B
is at
20
∘
C
.
Hence, heat in flow from
DB
=
heat out flow from
BC
.
⇒
H
DB
=
H
BC
⇒
k
A
(
θ
D
−
θ
B
)
l
2
=
k
A
(
θ
B
−
θ
C
)
l
1
As rods are of same material and area,
θ
D
−
θ
B
l
2
=
θ
B
−
θ
C
l
1
⇒
l
1
l
2
=
θ
B
−
θ
C
θ
D
−
θ
B
=
20
−
0
90
−
20
=
2
7
© examsnet.com
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