σ has a disc of radius R cut out (see figure). The magnitude of the electric field at a distance a above the center of the disc is given by?
An infinitely large surface of uniform charge density
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Shit man. I by mistake took it a ring. Anyways thanx
Consider elemental ring of radius x and thickness dx on sheet. Using this calculate the net electric field by putting limits R to infinity.
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Note : For finding the electric field at a distance x from a charged circular disc of surface charge density σ , one should consider elementary rings of charges on the disc and then integrate.