Two horizontal parallel plates each of area 500cm2 are mounted 2 mm apart in vacuum. The lower plate is earthed and the upper one is given a positive charge of 0.05μC. Find the electric field intensity and the potential difference between the plates.

Given,

Area of the plates (A)=500cm2=500104m2
Distance (d)=2mm=2103m
charge (q)=0.05μC=0.05106C
Electric field intensity (E)=?
Electric Potential (V)=?

We have,
E=σϵ0=qϵ0A=0.051068.851012500104
        =112.9103V/m

And
V=Ed
    =112.91032103=226V

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