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A charge \( \mathrm{Q} \) is uniformly distributed on a ring of
P radius \( \mathrm{R} \). The electric potential on the axis of ring at distance \( \mathrm{x} \) from the centre is
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(1) \( \frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{4 Q}{\sqrt{R^{2}+x^{2}}} \)
(2) \( \frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{2 Q}{\sqrt{R^{2}+x^{2}}} \)
(3) \( \frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{3 Q}{\sqrt{R^{2}+x^{2}}} \)
(4) \( \frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{Q}{\sqrt{R^{2}+x^{2}}} \)
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