Magnetic field

Lines of force

The magnetic field is the only field where the lines of force that show the direction of the field can be made visible.

In the visual on the left you can see a surface covered with iron filings. If you click on the magnet control, you will see the lines of force because each iron particle turns into a small magnet and they all line up according to the lines of force.

There is a convention that states that lines of force leave from the north pole of the magnet and enter the south pole, as we can see in the figure attached.

Inside the magnet, the lines of force are parallel, which means that the value of the field intensity is homogeneous.

Click on next to see the lines of force of the Earth.

	Natural magnets
	Lines of force
	Magnets and currents
	Conclusions

	on a charged particle
	on a straight cable
	on a loop
	Conclusions

	by a charged particle
	by a rectilinear current
	by a coil
	An explanation of natural magnetism
	Conclusions

	Magnetic flux
	The laws of Faraday and Lenz
	Self-induction
	Conclusions

	The generation of alternating currents
	A circuit of alternating current
	Conclusions