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      <pre><br></pre>

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      <td colspan="2" rowspan="1" style="vertical-align: top; background-color: rgb(204, 0, 0); width: 828px; height: 116px;">
      <pre><big><span style="color: white;"></span><big><big><big><big><big><span style="color: rgb(255, 255, 204);">My first web page about...</span></big></big></big></big></big></big></pre>

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      <pre><br></pre>

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      <pre><big><big><big><big><big><span style="color: rgb(255, 255, 204);">MAGNETISM</span></big></big></big></big></big></pre>
      <pre><big>
      </big></pre>
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      <pre><img style="border: 3px solid ; width: 466px; height: 242px;" alt="magnet" src="../earth-and-magnet.jpg.gif"></pre>

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      <pre><big><big><big><big><span style="color: rgb(153, 0, 0);">CONTENTS:</span></big></big></big></big></pre>

      <ol>
        <li style="color: rgb(153, 0, 0);"><a href="#1._Detection_of_a_Magnetic_Field"><big>Detection of a magnetic field</big></a></li>
        <li style="color: rgb(153, 0, 0);"><a href="#2._Compass"><big>Compass</big></a></li>
        <li style="color: rgb(153, 0, 0);"><a href="#3._Using_a_compass_to_show_the_magnetic_"><big>Using a compass to show the magnetic field</big></a></li>
        <li style="color: rgb(153, 0, 0);"><a href="#4._Earth_is_a_huge_magnet_"><big>Earth is a huge magnet</big></a></li>
        <li style="color: rgb(153, 0, 0);"><a href="#5._Iron_filings_"><big>Iron filings&nbsp;</big></a></li>
        <li style="color: rgb(153, 0, 0);"><a href="#6._Summary"><big>Summary</big></a></li>
      </ol>
      <div style="text-align: center;"><a href="http://www.wikipedia.org/"><big style="text-decoration: underline;">for further information about magnets...</big></a><br>
      <a href="http://www.google.es/"><br>
Any doubt? google them! </a><br>
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<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="1._Detection_of_a_Magnetic_Field"></a>1.
Detection of a Magnetic Field</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">Any source of
magnetism, such as a magnet or electromagnet, is surrounded by a
magnetic field. That field can be detected by various devices, which
can also give information about the direction of the field and even
its strength.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">A simple
compass can detect a magnetic field and demonstrate its direction.
Iron filings can be used to show the shape of a magnetic field.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">Questions you
may have include:</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<ul><li><p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">How does
	a compass detect a magnetic field?</font></p>
	</li><li><p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">How do
	iron filings demonstrate a magnetic field?</font></p>
</li></ul>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">This web-page
will answer those questions.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="2._Compass"></a>2. Compass</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">A compass is
simply a thin magnet or magnetized iron needle balanced on a pivot.
It can be used to detect small magnetic fields. The needle will
rotate to point toward the opposite pole of a magnet. It can be very
sensitive to small magnetic fields.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="3._Using_a_compass_to_show_the_magnetic_"></a>3. Using a
compass to show the magnetic field</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">When you
bring a compass near an item suspected of being magnetized or having
a magnetic field, the compass will turn and point toward the
appropriate pole of the object.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" align="center" lang="en-GB"><font size="4">Compass
needle attracted to magnet's N pole</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">A famous
experiment showed that a wire with DC electric current running
through it created a magnetic field. When the electricity was turned
on, a nearby compass moved to indicate a magnetic field was present.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="4._Earth_is_a_huge_magnet_"></a>4. Earth
is a huge magnet</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">The compass
was used to discover that the Earth is a huge magnet. The
North-seeking pole of the compass needle will always point toward the
Earth's North magnetic pole.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="5._Iron_filings_"></a>5. Iron
filings</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">By spreading
fine iron filings or dust on a piece of paper laid on top of a
magnet, you can see the outline of the magnetic lines of force or the
magnetic field. The picture below</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" align="center" lang="en-GB"><font size="4">Iron
filings and compasses show the shape and direction of the magnetic
field</font></p>
<p style="margin-bottom: 0cm;" align="center" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">This
experiment also shows that magnetism will act through many materials,
such as paper. Would the experiment work if a sheet of iron were used
to sprinkle the filings? What about aluminum foil?</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4"><b><a name="6._Summary"></a>6. Summary</b></font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><font size="4">Magnetic
objects are surrounded by a magnetic field. Devices can detected the
field and also give information about the direction of the field and
even its strength. A compass can detect a magnetic field and show its
direction. Iron filings can show the shape of a magnetic field. A
gaussmeter can detect a field and indicate its strength.</font></p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>
<p style="margin-bottom: 0cm;" lang="en-GB"><br>
</p>

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