Magnetic field lines and magnetic flux density

Thread starter AlanTuring
Start date Jan 31, 2020
Tags

Density Field Field lines Flux Flux density Lines Magnetic Magnetic field Magnetic field lines Magnetic flux Magnetic flux density

In summary, the relationship between the number of field lines passing through a region and the magnetic force in that region can be understood in two ways: the vector field approach, which considers the magnitude of the vector at a given point as the strength of the field, and the concept of flux lines, which describes the density of field lines in a given area. These two approaches can be used together to plot the same data. While it may seem contradictory to say that there is a field line passing through every point in space, this is possible because there are an uncountable number of points in space. Both the density and direction of these field lines are important in understanding the strength of the magnetic field.

Feb 8, 2020

hutchphd

Science Advisor

Homework Helper

Dadface said:

Definitions such as the one above don't make sense and that seems to be the reason why the person who wrote the opening post got confused. The concept of field lines, though useful, has shortcomings that don't seem to be realized by the people who write the bad definitions.

I could not agree more.
When one represents the field by drawing "lines" (which I shall continue to call flux lines!), they are always distributed so that their density is proportional to the local field strength. There is nothing within the definition of a"field line" that requires this constraint, and without it they show only the local direction of the field...not nearly so useful.
I truly don't understand the controversy here.

<h2>1. What is a magnetic field line?</h2><p>A magnetic field line is an imaginary line that represents the direction and strength of a magnetic field. It is drawn in the direction of the force that a magnetic north pole would experience if placed at that point in the field.</p><h2>2. How are magnetic field lines created?</h2><p>Magnetic field lines are created by moving electric charges, such as electrons, within a magnetic field. These moving charges create a magnetic field, which can be visualized using the magnetic field lines.</p><h2>3. What is the significance of the density of magnetic field lines?</h2><p>The density of magnetic field lines represents the strength of the magnetic field. The closer the lines are together, the stronger the magnetic field is at that point. The density of the field lines is also used to calculate the magnetic flux density.</p><h2>4. How is magnetic flux density calculated?</h2><p>Magnetic flux density is calculated by dividing the magnetic flux by the area through which the magnetic field passes. It is measured in units of Tesla (T).</p><h2>5. What is the relationship between magnetic field lines and magnetic flux density?</h2><p>Magnetic field lines and magnetic flux density are closely related. The density of magnetic field lines is used to calculate the magnetic flux density, which represents the strength of the magnetic field. Additionally, the direction of the magnetic field lines corresponds to the direction of the magnetic flux density vector.</p>

1. What is a magnetic field line?

A magnetic field line is an imaginary line that represents the direction and strength of a magnetic field. It is drawn in the direction of the force that a magnetic north pole would experience if placed at that point in the field.

2. How are magnetic field lines created?

Magnetic field lines are created by moving electric charges, such as electrons, within a magnetic field. These moving charges create a magnetic field, which can be visualized using the magnetic field lines.

3. What is the significance of the density of magnetic field lines?

The density of magnetic field lines represents the strength of the magnetic field. The closer the lines are together, the stronger the magnetic field is at that point. The density of the field lines is also used to calculate the magnetic flux density.

4. How is magnetic flux density calculated?

Magnetic flux density is calculated by dividing the magnetic flux by the area through which the magnetic field passes. It is measured in units of Tesla (T).

5. What is the relationship between magnetic field lines and magnetic flux density?

Magnetic field lines and magnetic flux density are closely related. The density of magnetic field lines is used to calculate the magnetic flux density, which represents the strength of the magnetic field. Additionally, the direction of the magnetic field lines corresponds to the direction of the magnetic flux density vector.