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NCERT Class XII Chapter
Current Electricity
Questions With Solutions

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Question : 7
Total: 24
A silver wire has a resistance of 2.1 Ω at 27.5°C and a resistance of 2.7 Ω at 100°C. Determine the temperature coefficient of resistivity of silver.
Solution:  
T1 = 27.5 °C , R1 = 2.1 Ω , T2 = 100 °C and R2 = 2.7 Ω
Using the relation, R2 = R1 [1 + α (T2−T1)] , we have
Temperature coefficient of resistivity of silver,
α =
R2−R1
R1(T2−T1)
 =
2.7−2.1
2.1×(100−27.5)
 =
0.6
152.25
 = 3.94 × 10−3 or 0.0039 °C−1
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