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what your test charge is.
No matter what, if a charge is free to move in
an applied electric ﬁeld, it will move in the
direction that lowers its potential energy. Electric Potential Electric Potential Example
An electron in the picture tube of an older
TV set is accelerated from rest through a
potential difference ΔV!=!5000V by a
uniform electric ﬁeld. What is the change in
potential energy of the electron? What is
the speed of the electron as a result of this
acceleration (assume it started from rest)? Answer
Draw a quick picture of the situation: E –v Since the electron moves in the opposite
direction as the electric ﬁeld, its electric
potential will increase as a result of this motion.
If this would have been a proton, then the
electric potential would have decreased as a
result of its motion.
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