Electric Field over an infinite sheet

[VitaX]

Homework Statement

Homework Equations

E = σ/2ε₀ (infinite sheet)
E = σ/2ε₀(1 - z/(z^2 + R^2)^1/2) (charged disk)

The Attempt at a Solution

Is this the correct method below?

E = σ/2ε₀ (infinite sheet) - [σ/2ε₀(1 - z/(z^2 + R^2)^1/2)]

 

[supratim1]

yes...just subtract the independent fields due to infinite plane and the disc at point P. your expression is alright.