Field due to charged circular disc

[physicsexpert]

Let's discuss first problem of finding electric field due to a
circular flat disc containing uniform charge. The electric field of
a
disc of charge can be found by the superpositon of point charge
fields of infinitesmal charge elements. This can be done by summing
the fields of charged rings. For this first divide the annular disc
into concentric charged rings, then find the field due to a charged
ring at point P , at a distance z above the centre of the ring and
then integrate within the limits fron o to R where R is the radius of
the disc. See yourself whether field due to this configuration can be
found using gauss's law or not, We can discuss this thing.


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