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Explanation of the negative integral

As referred to this question Why can't charge be in a stable equilibrium in electrostatic field?, it is given that Fig. 5–1.If $P_0$ were a position of stable equilibrium for a positive charge, the...

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Answer by lmr for Explanation of the negative integral

You have to understand that flux is determined by directional quantities. It describes a quantity that passes through an area. Obviously, it will make a difference in which direction the quantity...

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