Exam-style question
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What happens to the resistance of a wire if its cross-sectional area is doubled?.
- A.Resistance doubles
- B.Resistance halves
- C.Resistance remains the same
- D.Resistance quadruples
Model answer
What a good answer should say
- Resistance halves
Explanation
Why this works
Using the formula R = ρ(L/A), if the cross-sectional area (A) is doubled, the resistance (R) will decrease by half, assuming length (L) and resistivity (ρ) remain constant. Therefore, resistance halves when the cross-sectional area is increased.
Common mistake
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