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The movement of electrons: Introduction
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<strong><font size="5" color="white">The movement of electrons:</font></strong><font size="5" color="white">
Introduction</font>
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Being able to control the movement of electrons is fundamental for
making all electronic devices work. In this activity, you are going
to explore how electric and magnetic fields affect the movement of
electrons.
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<b>So, what is going on inside this old TV set that allows an image
to be viewed on the screen? And why is it so much clunkier than
modern TVs?</b>
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<img height="200" width="246" src="LCDTV.png">
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<b><font size="5" color="#5c7b67">The Discovery of Electrons</font></b>
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The story of the electron goes back over 100 years to J.J. Thomson
who first discovered them while performing experiments in 1897.
Until this time, atoms were thought to be fundamental particles - in
other words, it was believed there was nothing inside of the atom.
Thomson disproved this, showing that electrons were part of all
atoms.
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This instrument, the cathode ray tube (CRT), was what Thomson was
using when he discovered electrons. The CRT, as well as many other
devices, pushes electrons around. Electrons and other charged
particles can be pushed around by both electric and magnetic fields.
In this activity, you will explore how electrons create fields and
how they are influenced by fields. The device used by J.J. Thompson
in his experiments became the foundation of what made the first
televisions possible.
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<img height="190" width="292" src="crookesTube.jpg">
<br>
<span class="style1">Credit: D-Kuru/Wikimedia Commons</span>
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