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A point charge \( q \) is placed inside a conducting spherical shell of inner radius \( 2 R \) and outer radius \( 3 R \) at a distance of \( R \) from the center of the shell. Find the electric potential at the center of the shell.
(1) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{q}{2 R} \)
(2) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{4 q}{3 R} \)
(3) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{5 q}{6 R} \)
(4) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{2 q}{3 R} \)
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