The potential difference applied to an X-ray tube is 5 kV and the current flowing through it is 3.2 mA. Then what is the number of electrons striking the target per second? [The charge of one electron is e=−1.6×10−19 C]
A TV set picture tube shoots out a beam of electrons. The current due to this beam is 10 mA. How many electrons will strike the TV screen every second?