A current of 0.2 A passes through a metal wire for 20 s.calculate the number of electrons passing through the cross section of wire during this time.(The charge on an electron = -1.6? 10 -19C)

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I=0.2A
t=20s

​We Know I=Q/t
      current=charge/time
so,Q=It
     Q=20x0.2
        =4C

Now ,by quantization of charge
       Q= ne
        Total charge=  number of electrons x charge on 1 electron
        so,Q= 4C
​              e=-1.6x10^19c
              n=?
        so,4 = n x -1.6x10^-19C
            or n = 25 x 10^18 



 
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