Figure shows three circular arcs, each of radius \( R \) and total charge as indicated. The net ...

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Figure shows three circular arcs, each of radius \( R \) and total charge as indicated. The net electric potential at the center of curvature is
(a) \( \frac{Q}{2 \pi \varepsilon_{0} R} \)
(b) \( \frac{Q}{4 \pi \varepsilon_{0} R} \)
(c) \( \frac{2 Q}{\pi \varepsilon_{0} R} \)
(d) \( \frac{Q}{\pi \varepsilon_{0} R} \)
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