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Static charge
the sand would stand up
Both rods acquired charge of the same polarity during the rubbing process, so there will be a force of repulsion between them.
A plastic ruler is rubbed vigorously with a woolen cloth
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Tweed
Negative. Rubbing fabric onto a balloon causes an electron buildup on the balloon surface because its material has high insulative properties.
The balloon should have a small static electric charge which is enough to make it stick to the wall for a short time.
flanders
Brocade
Flanders
because the ballon have more electrons than the protons on the cloth,therefore, the electrons wil b moved from the balloons to the cloth and the attraction occurs.