The Origin of Magnetic Fields---> Is the Magnetic Force Fundamental?

What are magnetic fields produced by?

Electrically charged particles (protons and electrons)

When does a magnetic field appear?

When charged particles are moving

Whats the difference between a stationary electron and moving electron?

The stationary electron will produce an electric field, a moving electron will produce an electric and magnetic field

What is the origin of magnetism within atoms?

Electrons are constantly moving around within an atom, the orbital motion generates a magnetic field. Electrons are also spinning, even the individual electron on its own is a magnet

True or False, a wire with electric current running through it will generate a magnetic field

True

Who first discovered that wires generate magnetic fields?

Christian Oerstead

When did Christian Oersted observe magnetic fields in wires?

1820

How did Oersted observe wires generating magnetic fields?

He noticed that a wire deflected a compass

What was the significance of Oersteds discovery?

It was the first hint at a deeper connection between between electricity and magnetism

What myth exists about Oersteds observation?

That he discovered it by accident

What is required for particles to feel magnetic forces?

Motion

Will a stationary electron interact with the magnetic field?

No

True or False, current carrying wires exert magnetic forces on particles or other current carrying wires

True

What determines if the magnetic force attracts of pulls?

The direction of the current

Where does the magnetic field point in relation to a moving charge?

The magnetic field generated by a moving charge always point perpendicular to the direction the charge is moving

True or False, magnetic field lines do not come from anywhere and will loop around the moving charge

True

If a wire is coming out of a piece of paper where will the magnetic field move?

It will form closed loops parallel with the paper

If a current is moving towards you where will the magnetic field lines point?

Counterclockwise

What is a trick used to remember the direction of the magnetic field lines?

The right hand rule

What counts as moving depends on what?

Your point of view

What is speed?

How much somethings position has changed over some interval of time

True or False, physics is an observation based science

True

If we want to say that a train in moving 40 mph what do we have to specify?

Relative to the ground

Is speed relative?

Yes

How fast does the Earth move relative to the sun?

70,000 mph

How fast does the solar system orbit the center of the Milky Way?

ove 100,000 mph

How fast does the Earth rotate on its axis?

> 1,000 km/hr

How fast does the solar system move among stars?

70,000 km/hr

How fast does the milky way rotate?

800,000 km/hr

How fast is the movement within the local group?

300,000 km/hr

How fast does the universe expand?

70 km/s/Mpc

Can anyone at a constant speed consider themselves to be stationary?

Yes

Whether the magnetic field appears or not depends on what?

The observer

A proton moving through a magnetic field will experience a magnetic force, if another observer is moving with the proton how will the observer see the proton?

The proton will appear stationary

If one observer experiences a force in a system what does that mean?

All observers will see the force