6×10^17 electrons cross through an area per minute. What is the electric current ?

 Soln:- the charge carried by an electron =1.6×10^-19 C

Total charge carried by 6× 10^17 electrons is Q =6×10^17×1.6×10^-19 C. 

So, the current I=Q/t

=6×10^17×1.6×10^-19 C/60 s

=1.6×10^-3 A=1.6×mA.