Verified Solution • 2025–26 Session moderate

QNEET-2023-Ph-358: NEET 2023 Physics - Class 12 NEET-2023-Ph-358 Solution: A copper wire of radius 1 mm contains \(10^{22}\) free…

A copper wire of radius 1 mm contains 102210^{22} free electrons per cubic metre. The drift velocity for free electrons when 10 A current flows through the wire will be (Given charge on electron = 1.6×10−19 C1.6 \times 10^{-19}\ \text{C}): 6.25×104π ms−1\frac{6.25 \times 10^4}{\pi}\ \text{ms}^{-1} 6.25π×103 ms−1\frac{6.25}{\pi} \times 10^3\ \text{ms}^{-1} 6.25π ms−1\frac{6.25}{\pi}\ \text{ms}^{-1} 6.25×105π ms−1\frac{6.25 \times 10^5}{\pi}\ \text{ms}^{-1}

Multiple Choice Options

  • A 6.25×104πms−1\frac{6.25 \times 10^4}{\pi} \mathrm{ms}^{-1} � 6.25 _ 1 0 4 _ ms _ 1
  • B 6.25π×103 ms−1\frac{6.25}{\pi} \times 10^3 \mathrm{~ms}^{-1} � 6.25 _ _ 1 0 3   ms _ 1
  • C 6.25πms−1\frac{6.25}{\pi} \mathrm{ms}^{-1} � 6.25 _ ms _ 1
  • D 6.25×105πms−1\frac{6.25 \times 10^5}{\pi} \mathrm{ms}^{-1} � 6.25 _ 1 0 5 _ ms _ 1

Step-by-Step Verified Solution

I = neAV d V d = I neA = 10 10 22 _ 1.6 _ 10 _ 19 _ � _ 10 _ 6   V d = 6.25 � _ 10 3   m / sec

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