Q. An aluminium (Al) rod with area of cross-section $4 \times 10^{- 6}m^{2}$ has a current of 5 A flowing through it. Find the drift velocity of electron in the rod. Density of Al$= 2.7 \times 10^{3}\ {kgm}^{- 3}$ and atomic wt.=27u. Assume that each Al atom provides one electron.
A) $8.6 \times 10^{- 4}{ms}^{- 1}$
B) $1.3 \times 10^{- 4}{ms}^{- 1}$
C) $2.8 \times 10^{- 2}{ms}^{- 1}$
D) $3.8 \times 10^{- 3}{ms}^{- 1}$
Explanation
The correct answer is Option B: $1.3 \times 10^{- 4}{ms}^{- 1}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.