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The number of electrons strike the screen each minute when thee current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.
How to calculate electric charge?
Electric charge is equal to the product of electricity current flowing and the total time. It can be given as,
[tex]q=It[/tex]
Here, I is current and t is time.
The current in the electron beam of a typical video display terminal is 200 µa for one minute. Thus, the total charge is,
[tex]q=200\times10^{-6}\text{ A}\times(60\text{ s})\\q=0.012\rm \;C[/tex]
The number of electron flow is the ratio of total charge to the charge of one electron. The charge on one electron is 1.6×10⁻¹⁹ C. Thus, the number of electron is,
[tex]n=\dfrac{0.012}{1.6\times10^{-19}}\\n=7.5\times10^{16}[/tex]
Thus, the number of electrons strike the screen each minute when the current in the electron beam of a typical video display terminal is 200 µa is 7.5×10¹⁶.
Learn more about the electric charge here;
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