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40 left. E = E_1 + E_2 = \frac{q_{SL}}{S \varepsilon_0} - \frac{q_{SL}}{S \varepsilon_0} = 0.
E = E_1 + E_2 = \frac{q_{SL}}{S \varepsilon_0} - \frac{q_{SL}}{S \varepsilon_0} = 0.

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