### location | tract | field:

Magnetic field
* All magnetic fields arise from the motion of charges.
* Magnetic Fields Begins with ancient misunderstandings of magnetism.
* Most magnetic fields are man made.
* Most magnetic fields consist of fields
  - longitudinal fields
* Most magnetic fields have constant values
  - produce torque
* Some magnetic fields affect solar wind
* Some magnetic fields are created by current
  - electrical current
  - high electrical current
* Some magnetic fields create current
  - forces
* Some magnetic fields exert forces
  - transverse forces
  - exist in interiors
  - generate current
* Some magnetic fields have conductance
  - effects
  - hall conductance
  - magnetic poles
  - strength
* Some magnetic fields produce current
  - electric current
  - provide pressure
* Some magnetic fields surround straight wire
  - undergo reversals.
  * The strength of a magnet has to do with the spaces between the magnetic flux lines. The closer the flux lines are to each other, the stronger the magnet is. The farther away they are, the weaker. The flux lines can be seen by placing iron filings over a magnet. The iron filings move and arrange into the lines. Magnetic fields give power to other particles that are touching the magnetic field.
  * In physics, the magnetic field field that passes through space and which makes a magnetic force move electric charges and magnetic dipoles. Magnetic fields are around electric currents, magnetic dipoles, and changing electric fields
* accelerates the movement of cell ions.
* act a bit like rubber bands
  - as tightly strung wires
  - on all moving charges
* alter human sleep.
* appear to play an important role.
* are 'polar' fields with a North and South polarity.
* are a direct result of current, or the use of electricity
  - little like rubber bands
  - areas where an object exhibits a magnetic influence
  - around electric currents , magnetic dipoles , and changing electric fields
  - commonly a result of magnetic dipoles
  - conservative
  - different from electric fields
  - energetically important throughout most of the interstellar medium
  - essential to maintain health
  - invisible lines of force that surround all electrical devices and wiring
  - measures in units called gauss and are typically reported in milligauss
  - proportional to the size of the planet
  - strongest close to the device and diminish with distance
  - the same as electric fields
  - to be studied in the non-thermal polarised continuum
  - used to extract metals and mercury from bodies
* are vector fields
  - quantities, meaning they have both a magnitude and a direction
* arise from current flows.
* arise from the motion of electric charges, i.e. a current
  - only with relative movement between the charge and the observer
* block and redirect some of the energy, creating sunspots.
* can accidentally clear a computer disk
  - also affect components such as inductors in the oscillator circuitry
  - be a source of electricity, or electric fields
  - cause interference with electronic equipment, especially CRT monitors
  - deflect the path of a moving charged particle
  - diminish drug action
  - open new reaction pathways to alter rates and product distributions
  - penetrate walls and are difficult to shield against
  - reduce the material's superconductivity
* channel some gas along the axes to make the jets.
* clash with one another when a certain closeness creates a particle press.
* come from currents.
* control both the location and power density of the plasma
  - the travel of cosmic rays through space
* create current in the circuits they strike.
* exert forces on other moving charge.
* exist and do interact with the constituents of human tissues
  - as soon as a device is switched on and current flows
  - in a DC machine
  - only when the appliance is turned on and the current is flowing
* exposures in agricultural science laboratories.
* extract ions, keeping the beam in a very tight spread.
  - many properties that scientists and others have used over the centuries
  - no beginning or end
* help support molecular clouds against collapse.
* improve fuel mileage by affecting hydrocarbon bond strength.
* interact with the copper inducing currents and themselves become magnetic.
* is created by endless bar magnet, magnet is homogeneously magnetized
  - generated by moving charges
* make transformers and motors function, and have many other uses.
* move through the body as if it was air.
* obey the principle of superposition.
* occur when current flow through a wire.
* originate from everything with an electrical current
* pass through most materials, including concrete, steel, and lead.
* penetrate further and can stimulate more specifically
  - into the chromosphere and into the solar corona
  - the tissue inducing small local electrical currents that stimulate nerves
* permeate all space and play an important role in shaping the universe on all scales
  - the whole organism
* play a key role in space plasma processes.
* provide evidence of metallic conducting cores
  - support to the clouds against their self-gravitation
* provides a plausible link between disks and jets.
* reduce the growth inhibitory effect of tamoxifen in human brain tumor cells.
* remain frozen-in the solar plasma throughout the convective zone.
* result from the flow of current through the wires or electrical devices.
* run out from the north pole and enter a magnet's south pole.
* seem to hold sway in some aspects of animal behaviour.
* surround the earth.
* surrounding the black hole accellerate the particles into a narrow jet.
* tend to become concentrated as components are shrunk.
* threading a plasma can guide electric currents along intricate paths.
* vary in strength with the current and are present only when the current is flowing.
* vector quantity.