When the glass rod is rubbed with silk and gains a positive charge, it will attract items that have a negative charge, due to the principle that opposite charges attract.
Based on the charges you provided:
- Balloon 1 has a + charge (will not be attracted)
- Plastic sheet 1 has a - charge (will be attracted)
- Balloon 2 has a - charge (will be attracted)
- Plastic sheet 2 has a + charge (will not be attracted)
Thus, the rod will attract Balloon 2 and Plastic sheet 1.
Since the options provided include:
- Balloon 1, only
- Plastic sheet 2, only
- Balloon 1 and Plastic sheet 2
- Balloon 2 and Plastic sheet 1
The correct answer would be the last option related to which will be attracted by a positively charged rod, which would be Balloon 2 and Plastic sheet 1.
However, since that specific option isn't listed, it seems you might want to select just Balloon 2 (if that's an option you can choose) since it is the only negative charged object. In this case, considering the exact options you have provided, there is no valid response available since Balloon 1 and Plastic sheet 2 have a positive charge and will not attract the glass rod. Based on the provided options, the correct answer should be Balloon 2 and Plastic sheet 1, but it's not listed.
However, to select the closest one, you may want to mention Balloon 2 (if that was an available option). Otherwise, no options correctly match the expected answer based on the charged items.