As per the question,the current amplitude is given as i= -2.7 micro ampere
i.e -2.7 ×
as per the question the time is given as t=1.15s
we know that
hence q=i×t
hence the total charge passing through this point is given as
q= -2.7×× 1.15
= -3.105×
we know that q=ne where n is the number of electrons and e is the charge of electron
we have e= -1.602× coulomb
hence number of electrons n=
= 3.105××
=1.93820×