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Rub the rubber rob vigorously with the wool cloth. Wave the rubber rod near the hair....

Rub the rubber rob vigorously with the wool cloth. Wave the rubber rod near the hair. What happens? Now move the charged rod near the top of an electrometer without touching the plate. Does it has any changes to the metal needle in the middle of the electrometer as the rod is brought in closer or further way? Touch the charged rubber rod to the plate and roll the rod over the plate to try to get as much change from the end of the rod to the plate. What's the changes of the electrometer's needle?

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