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enter image description hereAs far as I know, a charged plate capacitor produces an electric field between the plates but outside the plates, the fields from the two plates as opposite just cancel out. If we can imagine a dielectric as an array of plates with different charges why its fields just don't cancel out outside the material like in the case of two metal plates?

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  • $\begingroup$ Your assumption of no field outside the plates is only true for infinite plates, otherwise not. The fields will be small, yes, but not zero. $\endgroup$ Commented Sep 3, 2021 at 21:39

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If we let $L$ be the side length of the plates and $D$ the distance between them, so that $L\gg D$. We can forget the border effects, and the field outside is still zero. Why are you saying that the field outside is non-zero?

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At first, the electric field outside the parallel plates is not exactly zero. Because there is some electric field exists, it's approximated to zero since it is very small. I had this question, that is answered well. See this post. Second, putting dielectric between the plates increases the capacitance.

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