MAGNETISM and its practical applications - ardent
... The total amount of electromagnetic energy cannot change! Eddy currents (also called Foucault currents) are electric currents induced within conductors by a changing magnetic field in the conductor. Eddy currents will be generated wherever a conducting object experiences a change in the intensity or ...
... The total amount of electromagnetic energy cannot change! Eddy currents (also called Foucault currents) are electric currents induced within conductors by a changing magnetic field in the conductor. Eddy currents will be generated wherever a conducting object experiences a change in the intensity or ...
Magnetic field lines
... Soft magnetic materials, such as iron, are easily magnetized They also tend to lose their magnetism easily ...
... Soft magnetic materials, such as iron, are easily magnetized They also tend to lose their magnetism easily ...
Earth`sInterior
... The deepest man has dug into the Earth is 5 km in the South Africa gold mines. (This is within the crust.) Here the temperature increases by 10 to 15 ˚C for every kilometer down. We have not actually been to the center of the Earth. So how can we infer what the composition of the Earth’s interior is ...
... The deepest man has dug into the Earth is 5 km in the South Africa gold mines. (This is within the crust.) Here the temperature increases by 10 to 15 ˚C for every kilometer down. We have not actually been to the center of the Earth. So how can we infer what the composition of the Earth’s interior is ...
Force on a Current Carrying Wire
... of the magnet face is approximately the length of the wire ℓ that will be in the magnetic field. Place home-made horseshoe magnet on the balance and record its mass mo . Be sure to orient the home-made horseshoe magnet so that the rigid aluminum rod is parallel to the faces of the magnet (and theref ...
... of the magnet face is approximately the length of the wire ℓ that will be in the magnetic field. Place home-made horseshoe magnet on the balance and record its mass mo . Be sure to orient the home-made horseshoe magnet so that the rigid aluminum rod is parallel to the faces of the magnet (and theref ...
Magnetism Lesson 2
... The earth’s magnetic North lies somewhere in the sea north of Canada but is shifting slowly over the years. The current theory no is that the Earth’s magnetic field is probably caused by electric currents circulating within the core of the Earth. Such currents are thought to be generated by the conv ...
... The earth’s magnetic North lies somewhere in the sea north of Canada but is shifting slowly over the years. The current theory no is that the Earth’s magnetic field is probably caused by electric currents circulating within the core of the Earth. Such currents are thought to be generated by the conv ...
Component Parts of a Dynamo
... required in order to rectify the alternating e.m.f. s induced in the armature conductors. Construction of the Field Magnet. Except for very small machines, all modern direct-current dynamos are of multi-polar construction, that is, they have more than two poles. Of the many forms which were in commo ...
... required in order to rectify the alternating e.m.f. s induced in the armature conductors. Construction of the Field Magnet. Except for very small machines, all modern direct-current dynamos are of multi-polar construction, that is, they have more than two poles. Of the many forms which were in commo ...
magnetism - WordPress.com
... • A special stone first discovered more than 2000 years ago in Greece, in a region called Magnesia; it attracted iron; they called it magnetite hence the magnet name. • About 1000 years ago they noticed that a hanging magnet always pointed to the North Star or Lodestar. So another name for naturally ...
... • A special stone first discovered more than 2000 years ago in Greece, in a region called Magnesia; it attracted iron; they called it magnetite hence the magnet name. • About 1000 years ago they noticed that a hanging magnet always pointed to the North Star or Lodestar. So another name for naturally ...
the pioneer earth indicator compass
... magnetism of the earth, the galvanometer will show zero only when the brushes are in line with the direction of the earth's magnetism. Therefore, when the galvanometer The Pioneer Earth Indicator Compass : Diagram show- shows no indication, we know that the brushes are in a line ing the generator-ar ...
... magnetism of the earth, the galvanometer will show zero only when the brushes are in line with the direction of the earth's magnetism. Therefore, when the galvanometer The Pioneer Earth Indicator Compass : Diagram show- shows no indication, we know that the brushes are in a line ing the generator-ar ...
Earth's magnetic field
Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 microteslas (0.25 to 0.65 gauss). Roughly speaking it is the field of a magnetic dipole currently tilted at an angle of about 10 degrees with respect to Earth's rotational axis, as if there were a bar magnet placed at that angle at the center of the Earth. Unlike a bar magnet, however, Earth's magnetic field changes over time because it is generated by a geodynamo (in Earth's case, the motion of molten iron alloys in its outer core).The North and South magnetic poles wander widely, but sufficiently slowly for ordinary compasses to remain useful for navigation. However, at irregular intervals averaging several hundred thousand years, the Earth's field reverses and the North and South Magnetic Poles relatively abruptly switch places. These reversals of the geomagnetic poles leave a record in rocks that are of value to paleomagnetists in calculating geomagnetic fields in the past. Such information in turn is helpful in studying the motions of continents and ocean floors in the process of plate tectonics.The magnetosphere is the region above the ionosphere and extends several tens of thousands of kilometers into space, protecting the Earth from the charged particles of the solar wind and cosmic rays that would otherwise strip away the upper atmosphere, including the ozone layer that protects the Earth from harmful ultraviolet radiation.