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Question

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?


1 (ampere) V (volts)

A

R1 = R2 = R3

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B

R1 > R2 > R3

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C

R3 > R2 > R1

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D

R2 > R3 > R1

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Solution

The correct option is C

R3 > R2 > R1


  1. Resistance is given by the slope of V-I graph.
  2. Here the graph is I-V graph.
  3. So, resistance is given by the inverse of the slope.
  4. From the graph, the order of the slope is slope of R1 > slope of R2 > slope of R3
  5. Therefore order of resistance is R3 > R2 > R1.

Hence, option (c) is correct.


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