作者nightkid (天地乖离す开辟の星)
看板Physics
标题Re: [题目] 这题有答案吗？
时间Wed Jan 27 13:48:36 2010
我是这样做 w = ω0 ; 之後的频率ω2 = ω
F = ke^2/r^2 + evB = mv^2/r
其中 ke^2/r^2 = mrw^2 ; evB = eωrB
=> F = mrw^2 + erBω = mrω^2
解一元二次方程式
ω = (eB+sqrt[(eB)^2 +4(mw)^2])/2m = (eB/2m) + sqrt[(eB/2m)^2 + w^2]
考虑弱磁场 也就是 eB/2m << w 根号内的eB/2m 忽略
ω = eB/2m + w
end
※ 引述《pap641217 (Plain&AttractivePhysics)》之铭言：
: 题目在：
: http://tinyurl.com/ye6xzn3
: 怎麽样就是得不到答案 A ，请网友帮忙提示一下 谢谢！！
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