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Byju's Answer
Standard IX
Physics
Resistance Thermometers
The resistanc...
Question
The resistance of a wire is
4.2
Ω
at
100
∘
C
and the temperature coefficient of the material is
0.004
/
∘
C
. Its resistance at
0
∘
C
is
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Solution
The effect of temperature on resistance is,
R
t
=
R
0
[
1
+
α
t
]
Where,
R
0
-is resistance at
0
∘
C
R
0
=
R
t
1
+
α
t
=
4.2
1
+
(
0.004
×
100
)
∴
R
0
=
4.2
1.4
=
3
Ω
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence,
(
B
)
is the correct answer.
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