Exam-style question
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What is the effect of increasing the length of a conductor on its resistance?.
- A.Resistance decreases.
- B.Resistance increases.
- C.Resistance remains constant.
- D.Resistance becomes zero.
Model answer
What a good answer should say
- Resistance increases.
Explanation
Why this works
According to the resistivity formula R = ρL/A, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area, increasing the length (L) of the conductor increases its resistance.
Common mistake
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