28. Magnetic Fields and Forces

Which statement correctly describes $B$ field lines?

When a compass is used near a bar magnet, what does the compass needle align with?

Which of the following statements about magnetic fields is true?

Which type of magnet can have its polarity reversed?

Which of the following materials would be attracted by a magnet?

A long straight wire carries a current upward. At a point located to the east of the wire, what is the direction of the magnetic field produced by the current at that point?

Which of the following materials is attracted to a magnet?

When two magnets are placed close together, which of the following best describes their interaction?

At point C near a straight current-carrying wire, what is the direction of the magnetic field $B$ produced by the current according to the right-hand rule?

When two bar magnets are placed with like poles facing each other so that they repel, what is the general pattern of the magnetic field lines between the magnets?

Which of the following statements is true about a $B$ field?

Which of the following statements about the creation of magnetic fields is correct?

In a diagram showing a bar magnet with magnetic field lines, which of the dashed boxes $a$–$d$ represents the position of the north magnetic pole?

When a positively charged particle moves through a uniform magnetic field, what determines the direction of its motion due to the magnetic force ($F$)?

At point D near a straight current-carrying wire, what is the direction of the magnetic field $B$ at point D?