An electron gun in a TV set shoots out a beam of electrons. The beam current is 2.1µA. How many electrons strike the TV screen for 5 seconds? How much charge strikes the screen in a minute?
"I=q\/t\\to I=ne\/t\\to n=It\/e=2.1\\cdot10^{-6}\\cdot5\/(1.6\\cdot10^{-19})=65625\\cdot10^9" (electrons).
"q=It=2.1\\cdot10^{-6}\\cdot60=126\\ (\\mu C)" . Answer
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