- #1

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2 parallel plates with equal charges lie close on top of each other.

although the electric field in between the plates cancel each other out, the Force on one plate from the other is

[tex]

F = \frac {\sigma^2}_{2 \epsilon} [/tex]

due to

[tex] \vec{\nabla} \cdot \vec{E} = 0 [/tex]

and

[tex] \rho = 0 [/tex]

why is the electric field [tex] \frac{\sigma}_{2 \epsilon} [/tex]

when the electric field between the plates is 0?