It consists of two large conducting sheets placed close to each other. Area of each plate is A and separation between them is d. One plate is given +Q charge and the other plate is given -Q charge.
Surface charge density
There exists a uniform field 
in between the sheets. As 
V = E x r in case of uniform field
V = V1 - V2 = E x d
V = E x d
Surface charge density
There exists a uniform field in between the sheets. As V = E x r in case of uniform fieldV = V1 - V2 = E x dV = E x d
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