charge~~
2007-10-15 1:07 am
How many electrons pass through a cow if it touches an electrified fence and receives a current pulse of 20mA ( on averge) for 0.1s?
回答 (1)
2007-10-15 1:24 am
✔ 最佳答案
current is the flow of eelctric charge per unit timethus 20/1000 = Q/0.1
where Q is the amount of charge passing through the cow
Q = 20x0.1/1000 C = 0.002 C
since an electron carries a charge of 1.6x10^-19 C
the no. of electrons passing = 0.002/1.6x10^-19 = 1.25x10^16
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https://hk.answers.yahoo.com/question/index?qid=20071014000051KK03619