Magnetic field

Magnetic field.

For better understanding:

• You have to investigate sources of information, examples and understanding of the material.
• Also, for better achievements, offer you to execute WebQuest, which includes a full internet resources research on the subject.
• This topic about magnetic field is closely connected with our daily life.

Your main task is first to review the proposed sites and information:

• Then go and read the questions and find the answers to them using the homepage on the subject.
• Make sure that you do your own job with understanding, rather than mechanical writing.

Please, try to find correct answers to the following questions: 

1.What are magnetic fields made of?

2. What can be defined from the Lorentz force law?

3.What is the magnetic force?

4. What magnetic force occurs?

5.What is the right hand rule?

6.How on the earth is magnetism created?

7.Why can't a magnetic field line go towards the South Pole from within itself?

8.What is the unit for magnetic field?

9.Why is Earth considered as a magnet?

10.What is magnetic field lines?

 

Here are the links, where you can get acquainted with the subject and its presentation:

• http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magfor.html#c1
• https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnets-magnetic/a/what-is-magnetic-force
• http://www.coolmagnetman.com/magfield.htm

ANSWERS: (According to the given resources.)

1.What are magnetic fields made of?

• A tremendous amount of research has gone into the area of elementary particle physics - the study of the basic building blocks of all the matter we know of.  We used to think that electrons, protons, neutrons and photons were all there was. However, we then discovered a host of other particles which make up the protons and neutrons. we know of 12 particles and 4 electro-weak forces and 1 strong force.  

2. What can be defined from the Lorentz force law?

• Both the electric field and magnetic field can be defined from the Lorentz force law.

3.What is the magnetic force?

• The magnetic force is a consequence of the electromagnetic force, one of the four fundamental forces of nature.

4. What magnetic force occurs?

• It occurs whenever objects interact in which there is charge in motion. 

5.What is the right hand rule?

• The right hand rule is a useful mnemonic for visualizing the direction of a magnetic force as given by the Lorentz force law.

6.How on the earth is magnetism created?

• Moving electric charges create magnetic fields.

7.Why can't a magnetic field line go towards the South Pole from within itself?

• This is because the electrons within the magnet are moving such that they create field lines going from the south pole to the north pole. 

8.What is the unit for magnetic field?

• The SI unit for magnetic field is the Tesla.

9.Why is Earth considered as a magnet?

• The earth has a magnetic field, created (we think) by the movement of liquid metal in the core.

10.What is magnetic field lines?

• Magnetic field lines are a way to visualize the magnetic field.   When drawn, the distance between them is an indication of the strength of the field.  The closer they are, the stronger the field. 

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