29. Sources of Magnetic Field

Why does the top magnet appear to float above the bottom magnet when two like poles are facing each other?

When two point charges, each moving parallel to each other with the same velocity $v$, are placed close together, what is the nature of the magnetic force between them?

When a group of atomic magnetic moments align in a magnetic material, this phenomenon is called what?

Which of the following statements about the magnetic force between two moving point charges is NOT true?

If a bar magnet is broken into two equal pieces, what happens to the magnetic properties of the resulting pieces?

Which of the following materials cannot be made into a magnet?

Which of the following elements is not ferromagnetic?

The fact that a compass needle is designed to always point north tells us what about Earth's magnetic field?

How does the $\mathrm{north} \mathrm{pole}$ of a magnet interact with the $\mathrm{poles}$ of other magnets?

If Caitlyn is holding two magnets and they are attracted to each other, which sides of the poles is she most likely holding together?

When you hold the $\mathrm{north}\mathrm{poles}$ of two different magnets close to each other, what will happen?

When you cut a bar magnet in half, what happens to the magnetic poles of the resulting pieces?

Which of the following objects has the strongest magnetic field?

Which of the following pairs of moving charges will experience the greatest magnetic force between them?

Two identical circular loops each carry a steady current $I$ in the same direction. In Case 1, the loops are placed parallel to each other with their currents circulating in the same sense (both clockwise or both counterclockwise). In Case 2, the loops are placed parallel but with their currents circulating in opposite senses. Which statement correctly describes the net magnetic force between the two loops in each case?