\[\begin {array} {1 1} (a)\;\frac{qa}{4 \pi \varepsilon_0 r^2} & \quad (b)\;\frac{qa^2}{4 \pi \varepsilon_0 r^3} \\ (c)\;\frac{q\bigg(\frac{a^2}{4}\bigg)}{4 \pi \varepsilon_0 r^3} & \quad (d)\;\frac{q}{4 \pi \varepsilon_0 r} \end {array}\]

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