Question

1. explain a proton is placed next to an negatively charged object. in which direction would the proton move? explain why
2. ccc cause and effect if you move two objects with opposite charges apart, what happens to the potential energy between them? explain your response.
3. identify how can you identify the magnetic north pole of an unlabeled magnet by using a labeled magnet?
4. apply concepts explain how potential energy changes when you pull a magnet off a refrigerator door.
5. sep develop models draw the magnetic field lines around a nail which has its head as its north pole and its point as its south pole.

revisit
anchoring phenomenon
how can the strength of a magnet be controlled?

Explanation:

1. A proton has a positive charge. Opposite charges attract. So, it will move towards the negatively - charged object.
2. The potential energy between two opposite - charged objects is given by the formula $U = k\frac{q_1q_2}{r}$. When $r$ (distance between them) increases, the potential energy increases as the work done to separate them is stored as potential energy.
3. The north pole of a magnet will be attracted to the south pole of a labeled magnet. By bringing the labeled magnet close to the unlabeled one, the end that is attracted to the south pole of the labeled magnet is the north pole of the unlabeled magnet.
4. When pulling a magnet off a refrigerator door, work is done against the magnetic force of attraction. This work is stored as potential energy, so the potential energy increases.
5. Magnetic field lines start from the north pole and end at the south pole outside the magnet. For a nail with its head as the north pole and point as the south pole, the field lines will emerge from the head, curve around the nail, and enter the point.

Answer:

1. The proton will move towards the negatively - charged object because opposite charges attract.
2. The potential energy between the two oppositely - charged objects increases as they are moved apart because work is done to separate them and this work is stored as potential energy.
3. Bring the labeled magnet close to the unlabeled magnet. The end of the unlabeled magnet that is attracted to the south pole of the labeled magnet is the north pole of the unlabeled magnet.
4. The potential energy increases when pulling a magnet off a refrigerator door as work is done against the magnetic force of attraction and is stored as potential energy.
5. Magnetic field lines emerge from the head (north pole) of the nail, curve around it, and enter the point (south pole) of the nail.