A plastic rod P carrying a negative charge is positioned above a plastic rod Q carrying a positive charge. In which directions do the electrostatic forces act on rod P and on rod Q?
- Aelectrostatic force on rod P: downwards; electrostatic force on rod Q: downwards
- Belectrostatic force on rod P: downwards; electrostatic force on rod Q: upwards
- Celectrostatic force on rod P: upwards; electrostatic force on rod Q: downwards
- Delectrostatic force on rod P: upwards; electrostatic force on rod Q: upwards