Facilitator`s Guide to Magnetism Planetary Magnetic Fields
... Magnetism, along with gravity and electricity, is a universal force of nature. This force is prevalent in our everyday lives: Magnetism is a property of certain metals and is also generated by electric currents inside circuits and, on a much larger scale, within planetary interiors. Earth itself has ...
... Magnetism, along with gravity and electricity, is a universal force of nature. This force is prevalent in our everyday lives: Magnetism is a property of certain metals and is also generated by electric currents inside circuits and, on a much larger scale, within planetary interiors. Earth itself has ...
EXAMPLE
... little magnets and align with the field. A compass can then be used to determine the direction of the arrow. Also, the strength of the magnetic field is obtained since more iron filings will be attracted to regions of higher magnetic field. ...
... little magnets and align with the field. A compass can then be used to determine the direction of the arrow. Also, the strength of the magnetic field is obtained since more iron filings will be attracted to regions of higher magnetic field. ...
Electric Generators and Motors
... There is no magnetic force on the top and bottom legs, since they are parallel to the B field. However, the magnetic force on the right side is into the page, page and the magnetic force on the left side is out of the page. page Therefore, the entire loop will tend to rotate. ...
... There is no magnetic force on the top and bottom legs, since they are parallel to the B field. However, the magnetic force on the right side is into the page, page and the magnetic force on the left side is out of the page. page Therefore, the entire loop will tend to rotate. ...
Lecture 12:introduction to B fields, aurora
... B is defined in terms of the magnetic force FB exerted on a moving electrically charged particle. Experimentally it is observed that, when a charge q has velocity v in a magnetic field, there is a force on the charge that is ...
... B is defined in terms of the magnetic force FB exerted on a moving electrically charged particle. Experimentally it is observed that, when a charge q has velocity v in a magnetic field, there is a force on the charge that is ...
Lab 4, part one
... he had the insight to change the orientation of his compass, and the needle turned in response to the current; when he reversed the current flow direction, the needle of the compass turned the other way. Ampère’s Law (Maxwell Equation 4) states that an electric current generates a magnetic field, an ...
... he had the insight to change the orientation of his compass, and the needle turned in response to the current; when he reversed the current flow direction, the needle of the compass turned the other way. Ampère’s Law (Maxwell Equation 4) states that an electric current generates a magnetic field, an ...
Magnetism
... in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point along the field line. Field lines converge where the magnetic fo ...
... in three dimensions.They are defined as follows. If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal) then the needle will always point along the field line. Field lines converge where the magnetic fo ...
in MSWord format
... been reversed many times during the geologic past. The effect of these reversals has been to create periods of "normal" magnetism (periods in which the polarity matched the present position of the north and south magnetic poles), and periods when the magnetic field was reversed. To test the plate te ...
... been reversed many times during the geologic past. The effect of these reversals has been to create periods of "normal" magnetism (periods in which the polarity matched the present position of the north and south magnetic poles), and periods when the magnetic field was reversed. To test the plate te ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.