How did scientists able to gather information about magnetic field?

Any source of magnetism such as a magnet or electromagnet is surrounded by a magnetic field. Information about this field can be retrieved from various devices. A compass can detect a magnetic field. The shape of the magnetic field can be demonstrated with iron filings. A gaussmeter will detect a field and indicate its strength, measured in gauss units.

A compass is simply a thin magnet or magnetized iron needle balanced on a pivot. It can be used to detect small magnetic fields. The needle will rotate to point toward the opposite pole of a magnet. It can be very sensitive to small magnetic fields.

Using a compass to show the magnetic field

When you bring a compass near an item suspected of being magnetized or having a magnetic field, the compass will turn and point toward the appropriate pole of the object.

A famous experiment showed that a wire with DC electric current running through it created a magnetic field. When the electricity was turned on, a nearby compass moved to indicate a magnetic field was present.

By spreading fine iron filings or dust on a piece of paper laid on top of a magnet, you can see the outline of the magnetic lines of force or the magnetic field.

A gaussmeter is used to measure the strength of a magnetic field. They use a electronic chip called a Hall effect device, which gives off a tiny electrical current when exposed to a magnetic field. The current is amplified with electronic circuitry and a meter shows the number of gauss (the units of magnetic field strength).

whilst volcanic lava remains interior the "liquid" form the small steel debris in the liquid lava line up with the earths magnetic container because it became on the time of eruption. whilst the lava cools and solidifies the magnetic debris are frozen in that orientation, so in case you understand the age of the solidified lava (using carbon relationship or some thing like it) you understand what the magnetic container became like at that factor. there is plenty greater unique recommendation in this challenge, particularly in case you prefer to bypass very a techniques lower back into the earths historic past, however the final generic theory is what I extremely have suggested above.

You can see the magnetic field by putting iron filings in it and see how it arranges itself, basically you get to see the magnetic lines behavior from this.