With carrier density n, area A and length l, the number of carriers is:

Question

Accepted Answer

D. n times l times A

1. The volume of the rod is its length times its area.
2. Multiplying by the number density gives the count.
3. So the total number of carriers is n l A.
_Source: syllabus Physics Part I, Chapter 4, Moving Charges and Magnetism._

Answer

n plus l plus A

Answer

n over l over A

Answer

n minus l minus A

With carrier density n, area A and length l, the number of carriers is:

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