$x$ axis. One is at $x=1.00\U{m}$, and the other is at
$x=-1.00\U{m}$. \Part{a} Determine the electric potential on the $y$
axis at $y=0.500\U{m}$. \Part{b} Calculate the change in electric
potential energy of the system as a third charged particle of
$x$ axis. One is at $x=1.00\U{m}$, and the other is at
$x=-1.00\U{m}$. \Part{a} Determine the electric potential on the $y$
axis at $y=0.500\U{m}$. \Part{b} Calculate the change in electric
potential energy of the system as a third charged particle of