## Related questions with answers

Question

The current in the electron beam of a typical video display terminal is $200 \mu \mathrm{A}$. How many electrons strike the screen each minute?

Solution

VerifiedAnswered 2 years ago

Answered 2 years ago

Step 1

1 of 2From equation (29-1) we can find the total charge of electrons passed in one minute:

$\begin{align*} i &= \frac{d q}{d t} \\ d q &= i \cdot d t \\ \Delta q &= \int i \cdot d t \\ \Delta q &= i \cdot \Delta t = 2 \cdot 10^{-4} \ \text{A} \cdot 60 \ \text{s} \\ \Delta q &= 0.012 \ \text{C} \end{align*}$

To find the number of passed/striking electrons we have to divide the total passed charge with the charge of a single electron $q = e$.

$\Delta N = \frac{\Delta q}{e} = \frac{0.012 \ \text{C}}{1.602 \cdot 10^{-19} \ \text{C}}$

$\boxed{\Delta N \approx 7.49 \cdot 10^{16}}$

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