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An ion (an atom with electrons added or removed) has 2 more electrons than protons. It starts at a point where the electric potential is
An ion (an atom with electrons added or removed) has 2 more electrons than protons. It starts at a point where the electric potential is +20 V and its intial kinetic energy is 100 eV. What is the electric potential at the position where the ion's velocity is zero? (Assume the only force acting on the ion is that of the electric field.)
(a) +120 V
(b) +70 V
(c) -30 V
(d) -80 V
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