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Electrostatics: Put it together --- Coulomb's Law
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<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF">Electrostatics:</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF">
Put it together --- Coulomb's Law</font>
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<img src="chargeMainIdea.png" width="98" height="58">
</td>
<td>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif">Coulomb's
Law can be described mathematically: the interaction force between
two charged particles is proportional to the product of the charges
divided by the square of the distance between them.</font>
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</tr>
</table>
</body>
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<img src="chargeBullet.png" width="33" height="23">
</td>
<td>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#5d6b86">A
little math</font></strong>
</td>
</tr>
<tr>
<td colspan="2">
<img src="rule.png" width="18" height="6">
</td>
</tr>
</table>
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In the model below the charge of the purple atom is Q<sub>1</sub>, the
charge of the green atom is Q<sub>2</sub> and the distance (r) can be seen
in the gray box.<br>
<ul>
<li>
Click the "Run" button and the graph will record the Coulomb forces as
the distance changes.
</li>
<li>
Reset the model by clicking the "Reset" button.
</li>
<li>
Change the charge of the purple atom.
</li>
<li>
Observe how it changes the graph.
</li>
</ul>
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Control Panel<br><br><input alt="tooltip" name="button name" type="submit" selfscript="enablecomponent 0 false;enablecomponent 1 true;" script="script:mw2d:1:run;" value="Run"><input alt="tooltip" name="button name" type="submit" selfscript="enablecomponent 0 true;enablecomponent 1 false;" script="script:mw2d:1:stop;" value="Stop"><input alt="tooltip" name="button name" type="submit" selfscript="enablecomponent 0 true;enablecomponent 1 false;selectcombobox 0 0;" script="script:mw2d:1:reset;" value="Reset"><br><br>
<select script4="script:mw2d:1:set %atom[0].charge -2;set textbox[2].text <t>Q1=-2</t>;" script3="script:mw2d:1:set %atom[0].charge -3;set textbox[2].text <t>Q1=-3</t>;" name="combo box name" script2="script:mw2d:1:set %atom[0].charge -4;set textbox[2].text <t>Q1=-4</t>;" script1="script:mw2d:1:set %atom[0].charge -5;set textbox[2].text <t>Q1=-5</t>;" script5="script:mw2d:1:set %atom[0].charge -1;set textbox[2].text <t>Q1=-1</t>;">
<option selected>Q1=-5
<option>Q1=-4
<option>Q1=-3
<option>Q1=-2
<option>Q1=-1
</select>
</center>
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Record the Coulomb Force in the box for each distance listed below.
<center>
<table width="100%">
<tr>
<td>
Charge of Purple Atom
</td>
<td>
Distance = 0.5nm
</td>
<td>
Distance = 1 nm
</td>
<td>
Distance = 1.5nm
</td>
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<tr>
<td>
-2
</td>
<td>
<input type="text" size="20" question="Force at distance = 0.5 nm when charge = -2">
</td>
<td>
<input type="text" size="20" question="Force at distance = 1 nm when charge = -2">
</td>
<td>
<input type="text" size="20" question="Force at distance = 1.5 nm when charge = -2">
</td>
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<tr>
<td>
-4
</td>
<td>
<input type="text" size="20" question="Force at distance = 0.5 nm when charge = -4">
</td>
<td>
<input type="text" size="20" question="Force at distance = 1 nm when charge = -4">
</td>
<td>
<input type="text" size="20" question="Force at distance = 1.5 nm when charge = -4">
</td>
</tr>
<tr>
<td colspan="4">
When the charge is double what happens to the force at 0.5 nm?
</td>
</tr>
<tr>
<td colspan="4">
<input type="text" size="89" question="When the charge is double what happens to the force at 0.5 nm?">
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</tr>
</table>
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<img src="chargeBullet.png" width="33" height="23">
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<td>
<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#5d6b86">Use
what you have learned to play a maze game</font></strong>
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</tr>
<tr>
<td colspan="2">
<img src="rule.png" width="18" height="6">
</td>
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The goal of this game it to move the white particle to the Target Area
before the timer (blue box with the number 10 in the target area) reaches
zero.
<ul>
<li>
Click Run.
</li>
<li>
<b>Click the button with "-" to add a negative charge, "0" to
neutralize, and "+" to add a positive charge to the white particle. </b>
</li>
<li>
Change the charge as it travels through the maze.
</li>
<li>
Use the Hint button if you run into trouble.
</li>
</ul>
Good luck!
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<input alt="tooltip" name="button name" type="submit" script="script:mw2d:2:set atom[0].charge -2;" value="-">
<input type="submit" script="script:mw2d:2:set atom[0].charge 0;" value="0">
<input type="submit" script="script:mw2d:2:set atom[0].charge 2;" value="+">
<input type="submit" selfscript="enablecomponent 3 false;enablecomponent 5 true;" script="script:mw2d:2:select textbox 2;remove;run;" value="Run">
<input type="submit" selfscript="enablecomponent 3 true;enablecomponent 5 false;" script="script:mw2d:2:reset;select textbox 2;remove;" value="Reset">
<input type="submit" selfscript="enablecomponent 3 true;enablecomponent 5 false;" script="script:mw2d:2:stop;" value="Stop">
<input type="submit" script="script:mw2d:2:message <t><font face=Verdana size=3>When the moving atom bumps to a static atom at a corner, it bounces a lot.<br>You should try to change its charge after the bouncing becomes much less.</font></t>;" value="Hint">
 
<select name="combo box name" script2="script:mw2d:2:set %MAX 200000" script1="script:mw2d:2:set %MAX 100000">
<option selected>Harder
<option>Easier
</select>
</center>
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<font><a href="page4.cml"><img width="60" height="26" border="0" src="prev.jpg">
</a><a href="page6.cml"><img width="59" height="26" border="0" src="next.jpg">
</a></font>
</td>
<td align="right">
<img width="54" height="26" src="page.jpg">
<font><a href="index.cml"><img width="46" height="26" border="0" src="index.jpg">
</a><a href="page1.cml"><img width="28" height="26" border="0" src="page1.jpg">
</a><a href="page2.cml"><img width="28" height="26" border="0" src="page2.jpg">
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