# How to solve this?

Consider a circular ring of positive charge with radius a, width da and surface charge density σ in C/m2.
Calculate the electric field (direction and magnitude) at a distance z from the centre of the ring.
Consider now a series of rings with the same width da but with radii ranging from 0 to ∞ so that they form an...
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Consider a circular ring of positive charge with radius a, width da and surface charge density σ in C/m2.

Calculate the electric field (direction and magnitude) at a distance z from the centre of the ring.

Consider now a series of rings with the same width da but with radii ranging from 0 to ∞ so that they form an infinite flat sheet. Calculate the resulting electric field at the same point at distance z.

Calculate the electric field (direction and magnitude) at a distance z from the centre of the ring.

Consider now a series of rings with the same width da but with radii ranging from 0 to ∞ so that they form an infinite flat sheet. Calculate the resulting electric field at the same point at distance z.

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