Exam-style question
Try this first
In a practical experiment, if the resistivity of a copper wire is found to be 1.68 x 10^-8 Ω·m, what does this indicate about the material?.
- A.It has high resistance.
- B.It is a good conductor.
- C.It is an insulator.
- D.It has low conductivity.
Model answer
What a good answer should say
- It is a good conductor.
Explanation
Why this works
The correct answer is It is a good conductor.. This is correct because it applies the Current electricity idea named in the question, using the required quantities and units rather than mixing current, charge, potential difference, resistance, power, or energy.
The other options are less suitable because they use the wrong electrical quantity, an incompatible unit, or a rule from a different circuit context.
Common mistake
No common mistake is linked to this question yet.