1.The charge on a rubbed polythene strip is typically -10^-9 C. If the charge carried by an electron is -1.6X10^-19C, how many extra electrons does the polythene strip carry?
2.TV and computer screens gather dust soon after they are cleaned by cloth. Explain briefly.
charge~
2007-10-15 12:55 am
回答 (1)
2007-10-15 1:19 am
✔ 最佳答案
1. since an electron carries 1.6x10^-19 Chence, the no. of electrons in the strip = 10^-9/1.6x10^-19 = 6.25x10^9
2. The screen is charged because of bombardment by electron beams, thus attracting dust in air.
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