29. Sources of Magnetic Field

Which of the following best describes the magnetosphere?

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

In the context of the magnetic field produced by moving charges, how many magnetic poles does a typical magnet have?

In the context of magnetic fields produced by moving charges, what are the opposite ends of a magnet called?

If the $\mathrm{Earth}$ were completely solid and did not have a liquid outer core, how would this affect the generation and appearance of its magnetic field?

Which of the following best describes how electromagnets are similar to other magnets?

Which part of the $Earth$ is primarily responsible for generating the planet's magnetic field?

Which of the following factors directly determines the strength of the magnetic field produced by a moving point charge at a given location in space?

Where do magnetic field lines exit the Earth today?

The amount of current determines the $\mathrm{magnitude}$ of the magnetic field when current flows through a conductor. Which property of the magnetic field is directly affected by the current?

Which of the following best explains what causes an object to be magnetic?

Which of the following statements correctly describes the direction of the magnetic field lines around a bar magnet?

When a compass is used near Earth's magnetic north pole, which pole of the compass magnet is attracted to Earth's magnetic north pole?

As you move a compass around a wire carrying current, what happens to the compass needle?