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<title>Electricity - Charged Particle Motion in an Electric Field -
Physics 299</title>
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<h1> <img src="ULPhys1.gif" height="50" align="texttop"
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<h1>Charged Particle Motion in an Electric Field <br>
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<center><img src="celticbar.gif" height="22" width="576"><br>
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<font color="#ff0000"><i>"</i></font><font color="#ff0000"><i>
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The hardest thing in the world to understand is the income tax"</i></font><br>
Albert Einstein<br>
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<li>Having determined the electric field we now want to determine
the behaviour of a point charge, q<sub>0</sub>, placed in this
field.</li>
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<li>The force on the charge is given by&nbsp; <b>F</b> = q<sub>0</sub><b>E</b>.&nbsp;
But Newton's second law tells us that <b>F</b> = m<b>a</b>, so
that the acceleration of the particle can be written, <b>a</b>
= (q<sub>0</sub>/m)<b>E</b>.</li>
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<li>Once we have an expression for the acceleration it is usually
possible to determine the trajectory of the particle, although
in the general case this will involve solving differential
equations.&nbsp; However, when <b>E</b> is constant the
acceleration is constant which allows us to use the kinematic
equations describing motion under constant acceleration from the
beginning of the first semester of this course (Physics
298).&nbsp; Important equations in Physics should never be
forgotten <img alt="sadface" src="sadface.jpg" height="24"
width="24">.&nbsp; <br>
</li>
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<li>In two dimensions, with <b>E</b> constant in one direction
and zero in the other, charged particle motion can be treated in
the same way as projectile motion of a particle under the
influence of a (constant) gravitational field.</li>
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<div align="center"><img alt="charged particle motion"
src="elec_charged_particle_motion.jpg" height="172" width="292"><br>
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<i><font color="#ff0000">What do you get if you have Avogadro's
number of donkeys?
Answer: molasses (a mole of asses)</font></i><br>
<br>
<img src="celticbar.gif" height="22" width="576"> <br>
&nbsp;
<p><i>Dr. C. L. Davis</i> <br>
<i>Physics Department</i> <br>
<i>University of Louisville</i> <br>
<i>email</i>: <a href="mailto:c.l.davis@louisville.edu">c.l.davis@louisville.edu</a>
<br>
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