In electronic circuits it is not unusual to encounter currents in the microampere range. assume a 35 μa (micro amp) current due to the flow of electrons in a circuit. what is the average number of electrons per second that flow past a fixed reference cross section that is perpendicular to the dir

n = 21.85 x 10¹³

Explanation:

Current is formed by the flow of free electrons in a conductor . It is  defined as rate of flow of charge per unit area .

If the given current represents n electrons flowing through a unit cross- sectional area per unit time

n x 1.6 x 10⁻¹⁹ = 35 x 10⁻⁶

n =  

n = 21.85 x 10¹³

i think the answer is a, hope this is right, that would be my best guess.