Exam-style question
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How does increasing the length of a wire affect its resistance?.
- A.Resistance decreases
- B.Resistance increases
- C.Resistance remains the same
- D.Resistance fluctuates
Model answer
What a good answer should say
- Resistance increases
Explanation
Why this works
According to the formula for resistance, R = ρ(L/A), where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area. Increasing the length (L) while keeping the cross-sectional area (A) constant results in a higher resistance.
Thus, resistance increases with length.
Common mistake
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