When a glass rod is rubbed with silk, it becomes positively charged due to the loss of electrons. To determine which items would be attracted to the positively charged glass rod, we should look for any negatively charged items or neutral items that can become polarized in the presence of a positive charge.
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Balloon 1: Generally, balloons become negatively charged when rubbed with certain materials, so it would be attracted to the positively charged glass rod.
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Balloon 2: Similar to balloon 1, if this balloon is also negatively charged, it would also be attracted to the glass rod.
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Plastic Sheet 1: If this is negatively charged, then it would be attracted to the positively charged glass rod as well. If it is neutral, it may also be attracted due to polarization.
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Plastic Sheet 2: The same reasoning applies here as with plastic sheet 1.
Based on typical behavior:
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If both balloons are negatively charged, they would be attracted: A (balloon 1) and E (balloon 1 and balloon 2) or just B (balloon 2) would be attracted.
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Whether plastic sheets 1 and 2 are charged or neutral determines their attraction to the glass rod.
So the most logical selections without specific information about the charges of the plastic sheets would be:
- E (balloon 1 and balloon 2) for both if they are negatively charged.
However, if we can't definitively analyze the plastic sheets' charges, it would be safer to select A (balloon 1) and B (balloon 2) if both balloons are negatively charged, and possibly the plastic sheets if they are negatively charged or neutral.
In summary, you would select items A, B, C, and possibly D. without specific information, it could be A (balloon 1) or B (balloon 2), or both balloons collectively.