In the given network, the potential at point \( O \) is (Given \( V_{O}-V_{S}=18 \mathrm{~V} \) ...

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In the given network, the potential at point \( O \) is (Given \( V_{O}-V_{S}=18 \mathrm{~V} \) )
(A) \( 9 \mathrm{~V} \)
(B) \( 780 / 47 \mathrm{~V} \)
(C) 680/43 V
(D) none of these
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