There is a current of 40 ampere in a wire of \[{{10}^{-6}}\,{{m}^{2}}\] area of cross-section. If the number of free electron per \[{{m}^{3}}\] is \[{{10}^{29}}\], then the drift velocity will be [Pb. PMT 2001]

• A.            \[1.25\text{ }\times ~{{10}^{3}}m/s\]
• B.                                      \[2.50\text{  }\times ~{{10}^{-3}}m/s\]
• C.            \[25.0\text{  }\times ~{{10}^{-3}}m/s\]
• D.                                      \[250\text{  }\times ~{{10}^{-3}}m/s\]