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<div class="moz-cite-prefix">On 01/21/2017 04:41 PM, Kathryn
Elizabeth Morris wrote:<br>
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<p>This is Katie in your CHM 331 class. I have one last question
about part c in the homework. How would I start off finding
the magnitude and direction of the vectors at the origin if
the origin does not have a point charge? </p>
<p>Thanks,</p>
<p>Katie</p>
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<br>
You can calculate the magnitude and direction of the electric at any
point in space resulting from the proximity to a point charge. <br>
<br>
For example, if you had a charge <img style="vertical-align:
middle" src="cid:part1.933EE3D6.C8254CE4@mercer.edu" alt="$q$"> at
(1,0), the magnitude felt at (3,0) would be<br>
<br>
<img style="vertical-align: middle"
src="cid:part2.4EEDA54D.98DF795F@mercer.edu" alt="$E = \frac{1}{4
\pi \epsilon_0}\frac{q}{r^2}=\frac{1}{4 \pi
\epsilon_0}\frac{q}{(3-1)^2}$"><br>
<br>
Since <img style="vertical-align: middle"
src="cid:part1.933EE3D6.C8254CE4@mercer.edu" alt="$q$"> is
positive the direction of the field would be along the positive <img
style="vertical-align: middle"
src="cid:part4.585C433D.1802C003@mercer.edu" alt="$x$">-axis. In
this case of multiple charge you would simply have to vectorially
add the individual fields.<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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