2nd year of post-compulsory secondary education
Magnetic field
José Luis San Emeterio
 Magn.  
All Teaching Units Print Home
An explanation of natural magnetism
 At the beginning of the unit, you were asked about the relation between the magnetic field created by a natural magnet and the magnetic field created by an electric current.
  Having studied the magnetic field created by an electromagnetic coil, you have seen the similarity between the field created by a coil and the field created by a natural magnet.

   In both cases, the polarity and the lines of force are similar.

 lineas de fuerza de un imán
   Click on to understand the cause of this similarity.
Background information
Natural magnets
Lines of force
Magnets and currents
Conclusions
The effects of the magnetic field
on a charged particle
on a straight cable
on a loop
Conclusions
The creation of magnetic fields
by a charged particle
by a rectilinear current
by a coil
An explanation of natural magnetism
Conclusions
Induced currents
Magnetic flux
The laws of Faraday and Lenz
Self-induction
Conclusions
Alternating current
The generation of alternating currents
A circuit of alternating current
Conclusions
Evaluation