Magnetism

They can attract all metals

They always have a north and south pole

They lose their magnetism in air

They are only found in nature

Like poles attract each other.

Opposite poles repel each other.

Like poles repel each other, and opposite poles attract each other.

There is only one type of magnetic pole.

Magnetic field lines exit from the North pole and enter at the South pole.

Magnetic field lines always form closed loops.

The strength of magnetic fields is measured in Teslas (T).

Magnetic field lines start and end at the same pole.

The force is maximum.

The force is zero.

The force is negative.

The force is doubled.

It determines the direction of the magnetic field only.

It determines the directions of force, velocity, and magnetic field vectors.

It is used to calculate the magnitude of the force on a charged particle.

It is only applicable to negative charges.

A circle with a dot: vector into the page (-z)

A circle with a cross: vector out of the page (+z)

A circle with a cross: vector into the page (-z)

A circle with a dot: vector out of the page (+z)

Magnetic field strength (B)

Amount of current (I)

Length of the wire (L)

Angle between current and magnetic field (θ)

Number of turns (N)

Current (I)

Magnetic field strength (B)

Length of wire (l)

τ = NIBA sin θ

τ = NIB sin θ

τ = NIA sin θ

τ = NBA sin θ