Question

4 x 10^18 electrons and 6 x 10^15 protons move through cross section per second in opposite directions.
Calculate the current.
(A) 0.016 A
(B) 0.16 A
(C) 1.6 A
(D) 16 A
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Answer 1

*** find the total charge flowing through the cross section that will be the answer

we know that charge of electron and proton is same but opposite charge here they are flowing in opposite direction so the net chare flowing can added.

total charge flowing =(no of electron +no of proton )×1.6×10^-19