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The Crooke's tube is a Cathode-ray tube, which is a cylindrical tube
with the cathode at one end, anode at the other, and a metal plate between
them. One end of the plate containing a horizontal slit is bent at right
angles to the length and its remaining surface is coated with a fluorescent
material which shows the path of the beam. When either a magnet or a charged
rod is brought near the tube the beam will be deflected in accordance with
well-known laws, from which the polarity of the charge is determinable.
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