※ 引述《Asce (Excalibur)》之銘言：
: [來源]Introduction to Electrodynamics/David J. Griffiths
: [題目]:Find the net force that the southern hemisphere of
: a uniformly chargerd sphere exerts on the northern
: hemisphere. (Total charge:Q、Radius:R)
首先以高斯定律求出球體內各點的電場值，再乘一小塊體積
的帶電來做積分，但方向的問題我不知道怎麼解決......
解答是3Q^2K/16R^2.
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