Charge \( Q \) coulombs is uniformly distributed throughout the volume of a solid hemisphere of ...

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Charge \( Q \) coulombs is uniformly distributed throughout the volume of a solid hemisphere of radius \( R \) metres. Then the potential at center \( O \) of the hemisphere in volts is
(a) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{3 Q}{2 R} \)
(b) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{3 Q}{4 R} \)
(c) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{Q}{4 R} \)
(d) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{Q}{8 R} \)
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