Upon exiting the heliopause, the local measurements of the magnetic field by Voyager 1, shown here
as a compass needle, differed by 40 degrees from the «true magnetic north» estimated to be the direction of the magnetic field in the pristine interstellar medium.
It works much
as a compass needle aligns with Earth's magnetic field.
It remained unknown, however, whether a swarm can be also controlled by external field in a way similar to permanent magnets (such
as compass needle).
Not exact matches
If you hold the
compass horizontal, the
needle will do one of three things: point to the same spot
as the last time you used it, spin slowly before stopping at a random point or point to anything magnetic that you happen to be wearing.
«You can think of it
as a little
compass needle that responds to external magnetic fields.»
As the spacecraft pushed into interstellar space, the
compass needle moved ever closer to true magnetic north.
Electrons also have a property known
as spin; an electron can «spin up» or «spin down,» pointing like a tiny magnetic
compass needle in one of two directions.
The magnetite particles are thought to act like microscopic
compass needles, relaying information to the nervous system by straining or twisting receptors in cells
as they attempt to align with the Earth's magnetic field.
Previous research had identified only cases in which bacteria
as a whole, filled with magnetic particles, are being oriented like
compass needles for swimming in the right direction.
By the end of this lesson, pupils will: 1) discover that a magnet can be made by stroking a steel bar with the same pole of a permanent magnet from one end to the other end in one direction 2) be able magnetise a
needle and use it
as a simple
compass.