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A platinum wire has resistance of 10ohm at 0c° and 20ohm at 273c°. What is the value of temperature coefficient of resistance of platinum?

Correct answer: A. 3.66 x 10 ̄3 k ̄1

  • A. 3.66 x 10 ̄3 k ̄1
  • B. 4.66 x 10 ̄3 k ̄1
  • C. 6.31 x 10 ̄3 k ̄1
  • D. 7.42 x 10 ̄3 k ̄1
  • E. 9.49 x 10 ̄3 k ̄1

Explanation

Formula for the temperature coefficient is as follows:= (20-10) / (10 x (273-0))=10/(10 x 273)=1 / 273=3.66 x 10-3 K-1

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About Temperature Coefficient of Resistivity

Temperature coefficient of resistivity describes how a material's resistivity changes for each degree change in temperature. Questions use the relation between resistance, temperature and the coefficient, especially for metallic conductors with positive values and semiconductors with negative values. Resistivity is a material property, unlike resistance, which also depends on dimensions.

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