Magnetic Fields - xΣ's Page

Magnetic fields in Magnets

Field travels from South to North
Field travels South to North inside the magnetic
Direction of field lines at any given point is equal to the direction of the force on the magnetic north pole at that point

Magnetics fields around a current-carrying wire

Any current-carrying conductor will induce a radial magnetic field around it in the direction found by the right-hand grip rule

Magnetic fields around and inside a solenoid

North pole = side which current is leaving It is possible to use the right-hand grip rule: switch current and magnetic field, the thumb points in the direction of the north pole.

Magnetic fields

A region of space where a magnetic pole experiences a force

Force on current carrying conductor inside a magnetic field

Fleming's Left-hand rule

Thumb: force

or Right-hand slap rule

Thumb: current
Fingers: field lines
Palm: force

When a current-carrying conductor $I$ of length $L$ is placed inside magnetic field $B$ at $90\degree$ it experiences a force $F$ .

F = BIL*sin(\theta)

Magnetic flux density

Force per unit length experienced by a long straight conductor carrying unit current and placed at right angles to the field at that point

Tesla

One tesla is the uniform magnetic flux density when a wire carrying a current of 1.0A is placed at right angles to a magnetic field and experiences a force per unit length of 1.0N

NMRI - Nuclear Magnetic resonance imaging

Quantum "spin" and magnetic moment of the proton

Particle nuclei (with differing numbers of protons and neutrons) have a quantum characteristic called spin. ... due to this spin, these nuclei have a magnetic moment

These magnetic moments allows these nuclei to interact with external magnetic fields