# Q 1.24(c): Two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude . What is E:(c) between the plates?

We know, electric field, E, due to an infinite plate (length>>thickness) having surface charge density   =     .

(To note: It's independent of distance from the plate!)

Let A and B be the two plates such that:

=

= -

Therefore,

The electric field between the plates,  E =    =

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