Given, current, I=10A Cross-sectional area, A=5mm2=5×10−6m2 Drift velocity, vd=2×10−3ms−1 The value of current flowing through a conductor can be given by I=neAvd....(i) where, n= number of free electrons and e= charge on an electron Putting all the given values in Eq. (i) we get 10=n×1.6×10−19×5×10−6×2×10−3 ⇒n=