作者asmalljulie ()
看板Physics
标题[问题] 库仑力??
时间Thu Mar 5 22:53:37 2009
1.
q1=68μC 在(0,1), q2=-34μC在(2,0), and q3=15μC 在(2,2)
Find the electric force on q3. A:1.6i-0.33j N
2.An electron is moving in a curcular path around a long
,uniformly charged wire carrying 2.5 nC/m.What's the
electron's speed? A:2.8Mm/s
这两题怎麽想都不会(．＿．?)
有请高手^^
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