When the glass rod is rubbed with silk, it gains a positive charge. According to the principles of electrostatics, objects with opposite charges attract each other.
In your scenario:
- Balloon 1 has positive charges (will not be attracted)
- Sheet 1 has negative charges (will be attracted)
- Balloon 2 has negative charges (will be attracted)
- Sheet 2 has positive charges (will not be attracted)
Since the glass rod has a positive charge, it will attract items with negative charges, specifically Sheet 1 and Balloon 2.
However, since those options are not listed as a choice, let's evaluate again based on the choices provided:
- "Balloon 1, only" - does not attract (both positive)
- "Plastic Sheet 2, only" - does not attract (both positive)
- "Balloon 1 and Plastic Sheet 2" - does not attract (both positive)
- "Balloon 2 and Plastic Sheet 1" - Balloon 2 attracts (negative) and Plastic Sheet 1 attracts (negative).
Therefore, the correct response considering that the teacher rubbed the glass rod giving it a positive charge, and the options presented would be:
Balloon 2 and Plastic Sheet 1.