The electric field!

From an isosceles right angled triangle of smaller side aa, a similar triangle of smaller side bb having same mid-point of common hypotenuse , has been removed. Now this arrangement has been given a surface charge density σ\sigma. Find the magnitude of electric field(in N/CN/C) to the nearest integer at the mid-point of hypotenuse.

Details:

σ=1.1×107C/m2,a=30cm,b=20cm,ϵ0=8.85×1012F/m\sigma = 1.1 \times 10^{-7} C/m^2 , a = 30 cm, b = 20 cm , \epsilon_{0} = 8.85 \times 10^{-12} F/m

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