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With carrier density n, area A and length l, the number of carriers is:
An plus l plus A
Bn over l over A
Cn minus l minus A
Dn times l times A
Answer & Solution
Correct 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: NCERT Class 12 Physics Part I, Chapter 4, Moving Charges and Magnetism._
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