Electromagnetism

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Arrow convention

Arrow: into the page

Dot : out of the page

Magnetic fields produce moving charges

Drawing of a magnetic field example

Lines never cross.

Opposite magnetic poles attract, similar magnetic poles retract.

Electromagnetism

Atomic magnetism

Domain theory

testing the domain theory

Induced magnetization

Demagnetization

Electromagnetic applications

Subtopic

MRI machine

Right hand rule

Thumb of right hand points in direction of current

Than fingers curl around wire in direction of magnetic field

Demonstration

Current is measured in Amperes

Moving charges produce magnetic fields

Magnetic fields

The magnetic force filed influences the space around the magnet

Drawing magnetic fields

Lines proceed N to S outside a magnet

forms closed loops within the magnet

Spacing of the lines represent strength of force

Closer the lines, greater the force

Magnetism basis

Every magnet has 2 poles

South pole seeks south direction on Earth.

North pole: seeks north direction on Earth.