Podcast
Questions and Answers
According to the listed geometric properties, which statement about magnetic field lines is always true?
According to the listed geometric properties, which statement about magnetic field lines is always true?
- They form closed loops that do not terminate.
- They are smooth curves that begin at a north pole and end at a south pole. (correct)
- They start at a south pole and end at a north pole.
- They may cross in regions of strong magnetic fields.
During the process of plotting magnetic field lines with a compass, what should be done after placing the compass and drawing the first arrow?
During the process of plotting magnetic field lines with a compass, what should be done after placing the compass and drawing the first arrow?
- Discard the compass and align the next arrow by observation.
- Move the compass so that the south pole end is on the last arrow, and draw a new arrow where the north pole now points. (correct)
- Rotate the compass 180 degrees and draw another arrow.
- Move the compass such that the north pole end is on the last arrow, and draw a new arrow where its south pole points.
If a plotting compass's south pole points east near a magnet, what can be concluded about the direction of the magnetic field at that point?
If a plotting compass's south pole points east near a magnet, what can be concluded about the direction of the magnetic field at that point?
- The magnetic field points south.
- The magnetic field points east.
- The magnetic field points north.
- The magnetic field points west. (correct)
What do the density and spacing of magnetic field lines indicate about the magnetic field in a region?
What do the density and spacing of magnetic field lines indicate about the magnetic field in a region?
How will a freely suspended magnet align itself in relation to the lines of magnetic force?
How will a freely suspended magnet align itself in relation to the lines of magnetic force?
Flashcards
Magnetic field line
Magnetic field line
A smooth curve that starts at a north pole and ends at a south pole.
Field lines never cross
Field lines never cross
Magnetic field lines never intersect.
Lines of force
Lines of force
A collection of lines that show the direction and strength of a magnetic field.
Field strength and lines of force
Field strength and lines of force
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Magnet orientation in field
Magnet orientation in field
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Study Notes
Plotting Magnetic Field Lines
- To plot magnetic field lines, follow these steps:
- Place a plotting compass at the desired point, aligning the north pole with the point. Then draw an arrow in the direction the north pole points.
- Move the compass so the south pole aligns with the previous arrow, then draw a new arrow from the north pole's new direction.
- Repeat until the desired point is reached.
- Connect the arrows with a smooth curve to form the magnetic field line.
- Repeat the process at different points near the north pole of a magnet to create multiple field lines.
Geometric Properties of Field Lines
- Magnetic field lines are smooth curves that begin at the north pole and end at the south pole.
- Arrows on the line show the direction of the force on a north pole.
- The force on a south pole is opposite to the north pole's direction.
- Field lines are often visualized as flowing like water, hence their nickname "lines of flux."
- Field lines never intersect.
Exercise 3.5
- If the south pole of a compass points east, the magnetic field direction is west at that point.
Lines of Force Application
- Lines of force demonstrate field direction and strength.
- Stronger fields have closer lines.
- Weaker fields have farther lines.
- A small suspended magnet aligns tangent to the field line at a specific point.
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