18 Questions
At any location, the direction of the magnetic field B is the direction in which:
The north pole of a compass needle points
What symbol has historically been used to represent a magnetic field?
B
How can magnetic field lines of a bar magnet be traced according to the text?
By means of drawings with magnetic field lines
When tracing the magnetic field lines of a bar magnet, where do the magnetic field lines outside the magnet point?
Away from the south pole
How can one display magnetic field patterns of a bar magnet, as shown in Figure 28.2?
Using small iron filings
Why is the north pole of a magnetic attracted toward the north geographic pole of Earth?
Because the south pole of the model bar magnet is near the north geographic pole
What is the relationship between the magnetic field lines and the magnetic field vector at any point?
The magnetic field vector is parallel to the field line.
How are the magnetic forces on oppositely charged particles moving at the same velocity in a magnetic field related?
They are in opposite directions.
What is the significance of the dashed lines in the figure?
They represent the paths of the particles being investigated.
According to the right-hand rule in Figure 28.5a, how can the direction of the cross product $\vec{v} \times \vec{B}$ be determined?
Point the four fingers of your right hand along the direction of $\vec{v}$, with the palm facing $\vec{B}$, and curl them toward $\vec{B}$. Your extended thumb points in the direction of $\vec{v} \times \vec{B}$.
What is the relationship between the magnetic force $\vec{F}_B$ and the cross product $\vec{v} \times \vec{B}$?
$\vec{F}_B = q(\vec{v} \times \vec{B})$
What is the meaning of the magnetic field $\vec{B}$ at a given point in space?
It represents the force acting on a moving charged particle at that point.
What is the pattern of the magnetic field between opposite poles (NS) of two bar magnets?
The magnetic field lines form a continuous loop between the north and south poles.
What is the pattern of the magnetic field between like poles (NN) of two bar magnets?
The magnetic field lines form a divergent pattern between the magnets.
How does the Earth's magnetic field compare to the magnetic field of a bar magnet?
The Earth's magnetic field is more complex than a simple bar magnet, but still similar.
What happens to the orientation of a compass needle as it is moved northward?
The needle rotates so that it points more and more toward the Earth's surface.
What is the difference between the North magnetic pole and the North geographic pole?
The North magnetic pole is near the North geographic pole, but not exactly the same.
How has the position of the North magnetic pole changed over time?
The North magnetic pole has moved hundreds of miles since 1900.
Explore the different magnetic field patterns between opposite poles, like poles, and surrounding a bar magnet. Learn about the Earth's magnetic field and its modeled representation originating from a bar magnet.
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