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知识点总结(需要背下来)计算一个点的电势就是$$\int_P^{+\infty}Edl$$计算出来是正的电势就为正,是负的电势就为负 电容器孤立导体球$$C=4\pi \varepsilon_0R$$ 平行板电容器$$C=\frac{\varepsilon_0 S}{d}$$ 同心导体球壳$$C=\frac{4\pi \varepsilon_0R_aR_b}{R...