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Coulomb Force: The Distance between Charges Matters
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Coulomb Force:</strong> The Distance between Charges Matters</font>
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<td><img src="chargeMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">The interaction between charged particles also depends on how far they are away from each other. The closer they are, the stronger the force is. On average, the Coulomb force extends over a remarkably long distance.</td>
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In the following experiment, you will examine how the Coulomb forces are
related to the distance between charges.<br><br><b>What you need to do:</b>
<ul>
<li>
There is a charged particle in the container. The slider on the right
is used to adjust its vertical position in the container.
</li>
<li>
Adjust the position of the particle.
</li>
<li>
Click "Shoot an electron."
</li>
<li>
Observe the trajectory of the electron.
</li>
<li>
Adjust the particle in order to get the electron to hit one of the
targets.
</li>
</ul>
</body>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Fill in a
snapshot image to prove that you succeeded in shooting an electron into
the blue rectangle.</font></strong>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Which of the
following settings would cause the shot electron to travel in a straight
line? Check all that apply.</font></strong>
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<html>Remove the postively charged particle.</html>
<html>Neutralize the positively charged particle.</html>
<html>Put a positive particle of the same charge on the exactly opposite site about the middle line.</html>
<html>Put a particle of the opposite charge on the exactly opposite site about the middle line.</html>
<html>Put a particle with a charge of opposite sign near the particle.</html>
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