A plastic flying disc with radius (25 mathrm{~cm}) is uniformly charged with (sigma=8 mathrm{nC} / mathrm{m}^{2}). Find

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A plastic flying disc with radius \(25 \mathrm{~cm}\) is uniformly charged with \(\sigma=8 \mathrm{nC} / \mathrm{m}^{2}\). Find the magnitude of the electric field at \(30 \mathrm{~m}\) on the axial position.

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