Exam-style question
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Explain how the length and cross-sectional area of a wire affect its resistance.
Model answer
What a good answer should say
- The resistance of a wire increases with length and decreases with an increase in cross-sectional area.
- This is because resistance is directly proportional to length and inversely proportional to area, as described by the formula R = ρL/A.
Explanation
Why this works
This question assesses understanding of the relationship between physical dimensions of a wire and its resistance. It requires knowledge of the resistivity formula and the concepts of proportionality, reinforcing the fundamental principles of electricity.
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