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# Charge passing through a conductor of cross -section area $A=0.3 m^2$ is given by $q=3t^2+5t+2$ in coulombs, where 't't is in seconds. What is the value of drift velocity at $t=2$ sec. Given $n= 2 \times 10^{25}/mn^3$:

$\begin {array} {1 1} (1)\;0.77 \times 10^{-5} m/sec & \quad (2)\;1.77 \times 10^{-5} m/sec \\ (3)\;2.08 \times 10^{-5} m/sec. & \quad (4)\;0.57 \times 10^{-5}m/sec \end {array}$

$(2)\;1.77 \times 10^{-5} m/sec$