Final answer:
In the context of electrostatic forces, a proton and an electron will attract each other, as will a proton and a -900 µC charge, because opposite charges attract.
Step-by-step explanation:
The question is asking about the electrostatic forces between different particles. These forces are fundamental to physics and help us understand how particles interact with each other. Electrostatic forces are part of the four fundamental forces in the universe and dictate that opposite charges attract while like charges repel.
- A proton and an electron: These particles will attract each other because a proton has a positive charge and an electron has a negative charge.
- An electron and a negative ion: These particles will repel each other since they both have negative charges.
- A proton & a +900 µC charge: These particles will repel each other because they both have positive charges.
- A proton & a -900 µC charge: These particles will attract each other because the proton has a positive charge and a -900 µC charge implies a negative charge.
- 2 neutrons: Neutrons are neutral particles and do not have an electrostatic force of attraction or repulsion between them, so they will not attract each other in this context.
- An electron & a neutrino: Neutrinos are neutral particles and will not have an electrostatic interaction with an electron.
Based on the information above, the pairs of particles that will attract each other are:
- A proton & an electron
- A proton & a -900 µC charge