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Flash of lightning
Place a metal
slice on dry glass, and on it a piece of hard foam plastic which you have
rubbed well on your pullover. If you hold your finger near the handle of the
slice, a spark jumps across.
When the
negatively charged plastic is placed on the slice, the negative electric
particles in the metal are repelled to the end of the handle, and the voltage
between it and the finger becomes equalised. Plastic materials can become
strongly charged. In warehouses, for example, metal stands for rolls of plastic
are earthed because otherwise they often spark when by the personnel.
