And lower case q sub 2 is the charge on the electron.

小写q加个下标2是指电子所带电量。

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All right, so that's just solving out the algebra, so we're saying what q solves, a - c over 2b - q2 over 2 = 0.

没错,只需要解出当,/2b-q2/2=0,时q2的值即可

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