The magnetic field.

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Magnetic Forces and Magnetic Fields

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Presentation transcript:

The magnetic field

Concept: the magnetic field Permanent magnets always have two poles (South and North), demonstration of the presence of the magnetic field

Electromagnet

Common sense knowledge about the magnetic fields - How compass is working? - Forces between the permanent magnets: attraction and repulsion Forces between magnets and certain metals (iron): always attraction Between moving magnets and conductors (copper, aluminuim): repulsion

The magnetic field as a physical phenomenon Magnetic induction vector, magnetic field vector, B-vector, magnitude and direction Unit: 1Tesla, 1T

Picture of the magnetic field Is chaning in the space

Picture of magnetic field: field lines B is tangential to the field lines at any points.

Definition of A magnetic field (sometimes) exerts a force to the moving charged particle. It depents on the direction of the field and the velocity.

Magnetic force is always perpendicular to the velocity of the charged particle.  It is able to change the direction of the velocity ony, it is not able to change the speed.

Magnetic Field and electromagnetic force Lorentz-formula for the electromagnetic force. Direction: Right hand rule

Magnetic force on the current-carrying wire