Every atom makes one free electron in copper. If $1.1 \mathrm{A}$ Current is flowing in the wire of copper having $1 \mathrm{mm}$ diameter, then the drift velocity (approx.) will be (density of copper $=9\times {10}^3 \mathrm{k}\mathrm{g}\mathrm{ }{\mathrm{m}}^{-\mathrm{3 }}$and atomic weight of copper  = $63$)

• Correct answer
  A

  $0.1 \mathrm{m}\mathrm{m }{\mathrm{s}}^{-1}$
• B

  $0.2\mathrm{ }\mathrm{m}\mathrm{m }{\mathrm{s}}^{-1}$
• C

  $0.3 \mathrm{m}\mathrm{m }{\mathrm{s}}^{-1}$
• D

  $0.2 \mathrm{m}\mathrm{m }{\mathrm{s}}^{-1}$

Hence, the correct answer is option: 'A'.