Electromagnetism

Magnetism basis

Every magnet has 2 poles

Every magnet has 2 poles

North pole: seeks north direction on Earth.

South pole seeks south direction on Earth.

Magnetic fields

The magnetic force filed influences the space around the magnet

Drawing magnetic fields

Spacing of the lines represent strength of force

Closer the lines, greater the force

Lines proceed N to S outside a magnet

forms closed loops within the magnet

Moving charges produce magnetic fields

Right hand rule

Thumb of right hand points in direction of current

Than fingers curl around wire in direction of magnetic field

Demonstration

Demonstration

Current is measured in Amperes

Electromagnetic applications

MRI machine

MRI machine

Subtopic

Subtopic

Atomic magnetism

Domain theory

testing the domain theory

Induced magnetization

Demagnetization

Opposite magnetic poles attract, similar magnetic poles retract.

Lines never cross.

Drawing of a magnetic field example

Drawing of a magnetic field example

Magnetic fields produce moving charges

Arrow convention

Dot : out of the page

Arrow: into the page