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The potential of a charged disk along the z-axis is givenby V=\frac{\sigma}{2 \epsilon_{0}}\left(\sqrt{z^{2}+R^{2}}-z\right) \vec{E}=-\vec{\nabla}=-\frac{\partial V}{\partial x} \hat{i}-\frac{\partial V}{\partial y} \hat{j}-\frac{\partial V}{\partial z} \hat{k} to calculate the E-field along the z-axis of the charged disk.

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