The hard rubber rod is again rubbed with wool and is thus negatively charged. Th

Question

The hard rubber rod is again rubbed with wool and is thus negatively charged. The charged rubber rod is then scraped along one end of an initially uncharged acrylic rod suspended from a plastic string. The rubber rod is then moved far away from the acrylic rod.

The acrylic rod is an insulator (i.e., charge is not free to move through the acrylic).

Which of the following pictures best represents the charge distribution on the acrylic rod after the rubber rod is moved far away from the acrylic rod?

Is the net charge on the acrylic rodpositive, negative,orzero?---Select---PositiveNegativeZero

When the rubber rod was scraped, the net charge on the rubber rod---Select---changedremained the same.

Explain your reasoning.

Explanation / Answer

It's the third stick down. The net charge is negative since the Acrylic rod was touched by a negative charge. The net charge had to change, even if by small amounts, as electrons were transferred.

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