Resistivity and conduction Quiz
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5 questions, one answer each
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1. A wire has resistance 8.0 Ω. A wire of the same material and diameter but twice the length has a resistance of
- A. 4.0 Ω
- B. 8.0 Ω
- C. 16 Ω
- D. 32 Ω
2. Which unit is correct for resistivity?
- A. Ω
- B. Ω m⁻¹
- C. Ω m
- D. Ω m²
3. In Core Practical 7, a graph of R against l is plotted. Which expression gives the resistivity?
- A. gradient × A
- B. gradient ÷ A
- C. gradient × l
- D. 1/(gradient × A)
4. Which change would increase the drift velocity of electrons in a wire, with the current and material unchanged?
- A. Increasing the cross-sectional area
- B. Reducing the cross-sectional area
- C. Increasing the number density
- D. Increasing the length
5. A uniform wire of length 2.0 m has 6.0 V across its ends. What is the potential difference between the 0.50 m point and the end?
- A. 1.5 V
- B. 3.0 V
- C. 0.75 V
- D. 12 V