A wire having an electric charge density of $=3\mathrm{.}4$ is formed into a ring as shown in the previous problem. If the radius of the ring is $R=3cm,$ then the magnitude of the electric potential at point $P$ which is $7\mathrm{.}8cm$ I from the center of the ring is$...$ volts. $\{$Write the answer with $1$ digit after the comma. Commas are written with dots.$)$