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An infinite plane at y = 3 m contains a uniform charge distribution of density 10-8/6π C/m2. Determine electric field at all points.

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y > 3

E = σ/2ϵ j = 10-8/(2 × 6π × 8.854 × 10-12) j = 29.959 j

Magnitude of electric field at all points is same since the electric field due to an infinite plane (or) disc is uniform. 

For y < 3 

E = -29.959 j 

For y<3, electric field is directed along negative y-axis. Unit vector along negative y-direction is –j.

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