CAIE A-Level Physics AS 9.1.4 Use for a Current Carrying Conductor the Expression I Anvq Questions
Use I = Anvq to calculate current in a current-carrying conductor.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- Use I = Anvq to calculate current in a current-carrying conductor.
CAIE A-Level Physics AS 9.1.4 Use for a Current Carrying Conductor the Expression I Anvq Questions question 1
[Maximum number: 1]
A cylindrical wire has cross-sectional area A and number density of free electrons n. The wire has current I and the free electrons have average drift speed v.
A second cylindrical wire has cross-sectional area 0.5 A and number density of free electrons 2 n. In this wire, the free electrons have average drift speed 2 v.
What is the current in the second wire?
A
0.5 I
B
I
C
2 I
D
4 I
C
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