Electric Field Above a Charged Circular Disk

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To find the electric field above a charged circular disk, start by considering an infinitesimal charge element, represented as σρ dρ dθ, where σ is the surface charge density. Focus on calculating the z-component of the electric field due to symmetry, as the radial components will cancel out. The next step involves setting up and evaluating the integral to sum the contributions from all charge elements. Once the integration is completed, the electric field at a distance z above the center of the disk can be determined. This approach simplifies the problem and leads to a clear solution.
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Hello guys,
I have a problem with actually starting up this problem (2.6) in "Intrroduction to electrodynamics" Griffiths.

Question

Find the electric field a distance z above the center of a flat cricular disk of radius R, which carries a uniform surface charge (sigma)?

I am having problems setting it up especially how 'da' looks like and also the whole integral.

Thanks.
 
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Find the electric field produced by an element of charge \sigma \rho d\rho d\theta at a position along the z-axis. You only need to consider the z-component of field due to the symmetry. Then it's just a matter of integration.
 
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Thank you i get it now Tide.
 

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