Click on the following link, listed in the Background Materials, to access the s
ID: 2115684 • Letter: C
Question
Click on the following link, listed in the Background Materials, to access the simulation
Fendt, W. (1999). Lorentz force (simulation). Retrieved on 13 Nov 07 fromhttp://www.sciencejoywagon.com/physicszone/otherpub/wfendt/lorentzforce.htm
In the simulation, the electrical current flows from positive (+) to negative (-). Notice that the current flows into the screen when the current source is on the left, and out of the screen when the current source is on the right. Change the direction of the current by clicking the "reverse current" button.
The lines of magnetic force flow from north (red) to south (green). You can flip the magnet vertically and change the direction of the magnetic field 180 degrees by clicking the "turn magnet" button.
In response to the magnetic field, the wire carrying the current is displaced either to left, or to the right.
Complete the following table. The first line has been filled in for you.
Current Direction
Magnetic Field Direction
Wire Displacement
Into screen
Top to bottom
Left
Into screen
Bottom to top
Out of screen
Top to bottom
Out of screen
Bottom to top
Write a one to two page paper summarizing the results of your experiment, and discussing these results in terms of what you have learned about the Lorentz force and the behavior of current carrying conductors placed in a magnetic field.
Current Direction
Magnetic Field Direction
Wire Displacement
Into screen
Top to bottom
Left
Into screen
Bottom to top
Out of screen
Top to bottom
Out of screen
Bottom to top
Explanation / Answer
Current Direction
Magnetic Field Direction
Wire Displacement
Into screen
Top to bottom
Left
Into screen
Bottom to top
Right
Out of screen
Top to bottom
Right
Out of screen
Basically, the Lorentz force is the force experienced by a charged particle in an electromagnetic field. There are two forces acting. The electric force acting on charge q is qE where E is the electric field and the magnetic force qv X B where v is the velocity of the particle and B the magnetic field strength.
Combining these
F = q(E + v X B)
Remember F,E v and B are vector quantities. If v is at right angles to magnetic field B then the above reduces to
F = q(E + vB)
You may not have gone into vectors in much depth, the above expresion v X B is the vector cross product of v and B and the resulting magnetic force is perpendicular to the plane formed by v and B.
Bottom to top
Left
Current Direction
Magnetic Field Direction
Wire Displacement
Into screen
Top to bottom
Left
Into screen
Bottom to top
Right
Out of screen
Top to bottom
Right
Out of screen
Basically, the Lorentz force is the force experienced by a charged particle in an electromagnetic field. There are two forces acting. The electric force acting on charge q is qE where E is the electric field and the magnetic force qv X B where v is the velocity of the particle and B the magnetic field strength.
Combining these
F = q(E + v X B)
Remember F,E v and B are vector quantities. If v is at right angles to magnetic field B then the above reduces to
F = q(E + vB)
You may not have gone into vectors in much depth, the above expresion v X B is the vector cross product of v and B and the resulting magnetic force is perpendicular to the plane formed by v and B.
Bottom to top
Left
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