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# Wire is bent in a circle of radius $10\;cm$ It is given a change on it uniformly. What is the electric potential at the center ?

$\begin{array}{1 1} 2.25 \times 10^7\;V \\ 22.5 \times 10^7\;V \\ 2.25 \times 10^6\;V \\ 0.225 \times 10^6 \;V \end{array}$

$q= 250 \mu c =250 \times 10^{-6}\;C$
$r= 10\;cm$
$\quad= 10^{-1}\;m$
$V= \large\frac{q}{4 \pi \in_0 r}$
$\quad= \large\frac{9 \times 10^7 \times 250 \times 10^{-6}}{10^{-1}}$
$\qquad= 2.25 \times 10^7\;V$
Answer : $2.25 \times 10^7\;V$