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
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.
i have empty ideas
Negative. Rubbing fabric onto a balloon causes an electron buildup on the balloon surface because its material has high insulative properties.
When rubbing a balloon with a wool cloth, it puts negative charges on the balloon. Negative charges attract to positive charges. If a balloon is not rubbed with the wool cloth, it has an equal amount of negative to positive charges, so it will attract to a rubbed balloon. When both balloons are rubbed with the wool cloth, the both receive negative charges, so they will repel each other.
The balloon should have a small static electric charge which is enough to make it stick to the wall for a short time.