Derive an expressin for the electric field intensity at the surface of the plate?
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Electric field intensity is the strength of an electric field at any point. It is equal to the electric force per unit charge experienced by a test charge placed at that point, or E= q \ F
From Gauss law, considering a spherical surface with charge at its center as Gaussian surface,
E(A)= ϵ \ 0
q
⟹E(4πr
2
)=
ϵ
0
q
⟹E=
4πϵ
0
r
2
q
which is the intensity of electric field at a distance r from the charge.
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