The current $$\(I\)$$ in a metallic conductor of cross-sectional area $$\(A\)$$ is given by $$\[ I=A n v e \]$$ where $$\(e\)$$ is the elementary charge and $$\(v\)$$ is the mean drift velocity of the conduction electrons. What is represented by the letter $$\(n\)$$ in the equation?
A.
B.
C.
D.
Exam No：9702_s25_qp_13 Year：2025 Question No：32
Answer:
C
Knowledge points:
9.1.1 understand that electric current is a flow of charge carriers
9.1.2 understand that the charge on charge carriers is quantised
9.1.3 define the coulomb
9.1.4 recall and use Q = It
9.1.5 derive and use, for a current-carrying conductor, the expression I = Anvq, where n is the number density of charge carriers
Solution:
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