Question

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

Answer 1

The average number of electrons per second that flow past a fixed reference cross section can be calculated by dividing the current by the charge per electron.

Step-by-step explanation:

The average number of electrons per second that flow past a fixed reference cross section can be calculated using the formula:

Number of electrons per second = Current / (Charge per electron)

Given a current of 35 μA (micro Amp) and the charge per electron as -1.60×10-19 C, we can substitute these values into the formula to find the average number of electrons per second.

Number of electrons per second = (35 × 10-6 A) / (-1.60×10-19 C) = -2.19 × 1013 electrons/second

Answer 2

n = 21.85 x 10¹³

Step-by-step 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 =
`\frac{35*10^(-6)}{1.6*10^ {-19 }}`

n = 21.85 x 10¹³