A disk of radius 2.4 cm carries a uniform surface charge density of 3.1 μ C/m2. Using reasonable approximations, find the electric field on the axis at the following distances.(adsbygoogle = window.adsbygoogle || []).push({});

I have used the equation E=(Q/ε_{0})(1/(4*pi*r^{2}))

I also tried the equation E=(Q/2(ε_{0}))(1-(z/(√(z^{2})+(r^{2})))

Thanks in advance for the help. Both equations have not led me to the correct answer.

*note, there is not a figure provided for this question*

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# Electric field at a distance from a charged disk

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