Exam-style question
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In a material with a resistivity of 1.0 x 10^-6 Ωm, if a wire of length 2 m and cross-sectional area 1 x 10^-4 m² is used, what is the resistance? Scenario focus: a resistivity investigation using wire length, where the response must distinguish material property from total resistance.
- A.0.02 Ω
- B.0.1 Ω
- C.0.5 Ω
- D.1 Ω
Model answer
What a good answer should say
- 0.02 Ω
Explanation
Why this works
The correct answer is 0.02 Ω. In this version, the deciding idea is a resistivity investigation using wire length, where the response must distinguish material property from total resistance.
That makes the correct option the one that uses the appropriate electricity quantity and unit, while the distractors either swap related circuit quantities or apply a rule from the wrong circuit situation.
Common mistake
No common mistake is linked to this question yet.