Magnetism. Moving electric charges create magnetic fields Electrons spinning around atoms are moving electric charges. Usually, opposite direction spinning.

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Presentation transcript:

Magnetism

Moving electric charges create magnetic fields Electrons spinning around atoms are moving electric charges. Usually, opposite direction spinning electrons pair up, and cancel the magnetic field.

Iron atoms have four unpaired electrons that create a net magnetic field. Cobalt and Nickel can also become magnetic

Electrons moving in a wire create a magnetic field Remember electro-physics is backwards…it assumes positive charges are moving

Right Hand Rule for Current Velocity of a “+” charge B is the magnetic field strength

Drawing Magnetic Fields Magnetic Vectors have to be shown in 3D Velocity of charge (+) Magnetic field strength Magnetic Force

Arrows are drawn in 2D To draw into or out of the board, “arrows” are also used X is the tail of an arrow into the board. is the arrow coming out of the board

If this was an electron moving in a magnetic field…which way is it being forced?

Formulae Magnitude of Magnetic Field B = F/qv Force charge velocity

A wire dragged through a magnetic field… F = BIl l = length of wire