A student experiments with electric charge. The student uses a dry cloth to rub
a plastic rod. The rod becomes positively charged.
Explain how the friction between the rod and the cloth causes the rod to become
positively charged. Use your ideas about the movement of charges.
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Explanation:
When a polythene rod is rubbed with a duster, the friction causes electrons to gain energy. Electrons gain enough energy to leave the atom and 'rub off' onto the polythene rod. If the rod is swapped for a different material such as acetate , electrons are rubbed off the acetate and onto the duster.
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