Wed August 01, 2012 By: Tanaya Saha

A TV set shoots out a beam of electron.The beam current is 10 mili ampere.How many electrons strike the TV screen in each second? How much charge strikes the screen in a minute?

Expert Reply
Wed August 01, 2012
The charge of an electron is 1.6 x 10-19C.
Thus for a current of 10 mA, the charge going to screen in one scond is 10 mC
thus number of electrons, n = (10 x 10-3)/(1.6 x 10-19) = 6.25 x 1016
In a minute charge striking the screen = 10 * 60 = 600 mC
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