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Re:请教这道题的公式

Posted by temp_ptr at 2012-01-02 18:21:32 on Problem 1031
In Reply To:请教这道题的公式 Posted by:luffy at 2005-08-21 13:32:05 
dI = cos(a) * k / r * dl * h;
dl = r * d(theta) / cos(a);
so:
dI = k * h * d(theta)
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