Magnetic Fields & Electromagnetism

They start on positive charges and end on negative charges.

They always form closed loops.

They are parallel to electric field lines.

They indicate the direction of the electric force on a positive charge.

Ferromagnetic

Paramagnetic

Diamagnetic

Non-magnetic

It will align itself perpendicular to the field direction.

It will not be affected by the magnetic field.

It will align itself with the field direction.

It will move in a circle.

The north and south poles are isolated.

The magnet loses its magnetism.

You get two smaller magnets, each with its own north and south pole.

The magnetic field disappears.

The magnetic field points directly toward the wire carrying current out of the page.

The magnetic field points directly away from the wire carrying current out of the page.

The magnetic field is zero.

The direction depends on the exact magnitude of the currents.

The resistance of a material to electric current.

How much a material will become magnetized in response to an external magnetic field.

The speed of light in a material.

The ability of a material to store electric charge.

Increasing temperature always increases permeability.

Increasing temperature always decreases permeability.

Temperature has no effect on permeability.

The effect of temperature on permeability depends on the material.

0.5

2

4

8

It increases linearly with distance.

It decreases linearly with distance.

It decreases with the square of the distance.

It remains constant with distance.

To attract objects to the ground.

To provide oxygen for breathing.

To protect us from harmful solar radiation.

To regulate the Earth's temperature.