The field is variable, changing continuously, and its poles migrate over time. Magnetic field definition of magnetic field by merriam. Sometimes, the term magnetic field may be also used to refer to the quantity magnetic field strength. They are directed from the north pole to the south pole. Magnetic field and magnetic field lines is explained in this video.
In fact, the number of lines relates to the magnetic fields strength at a given point. To locate the magnetic field of a bar magnet,we use iron filling or a magnetic compass. The idea of lines of force was invented by michael faraday. Magnetic field definition is the portion of space near a magnetic body or a currentcarrying body in which the magnetic forces due to the body or current can be detected. Magnetic flux is a measurement of how much magnetic field passes through an area. His theory is that all of reality is made up of force itself. In a bar magnet, the magnetic field lines look like these are lines which shows direction of magnetic force and its strength these are curved lines which start from north pole. A diagram showing a representative set of neighboring field lines is a common way of depicting a vector field in scientific and mathematical literature. Although both types of fields are interconnected, they do different things. In a region where the line density is high, one says that it has great intensity or strength. Oct 22, 2016 a uniform magnetic field is represented by equallyspaced, parallel straight lines.
The magnetic field is filled with magnetic lines of force. They describe the direction of the magnetic force on a north monopole at any given position. The use of field lines is an alternative way to represent the information contained within a magnetic vector field. Jan 09, 2018 in this video youll get to know about the proper meaning of magnetic field lines its other name subscribe, like and share. Magnetic fields can usually be seen by magnetic flux lines. The presence of the magnetic force along the imaginary lines can be demonstrated by inserting a sensitive material such as iron filings into the lines of magnetic effect. The magnetic field intensity depends on the number of magnetic field lines. It should be noted that the magnetic lines of force exist in three dimensions but are only seen in two dimensions in the image. This suggests the idea of lines of magnetic force and the idea has become one way of describing a magnetic files, although the field is continuous around a magnet what do the lines show. Field lines also show what happens to the magnetic fields of two magnets during attraction or repulsion. When the lines of the magnetic field are close together the magnetic field is strong. Magnetic field basics magnetic fields are different from electric fields. Magnetic field lines are the lines in a magnetic field the tangent of which at any point will give the field direction at that point and its density gives the magnitude of the field. Magnetic field, a vector field in the neighborhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable.
The last property is related to the fact that the north and south poles cannot be separated. Magnetic lines of force definition of magnetic lines of. The symbol b expresses the magnetic field, and it is measured in tesla or newton per meter. The magnetic field is strongest at the poles, where the field lines are most concentrated. Field lines meaning in the cambridge english dictionary.
Magnetic field definition, a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle. Magnetic field, a vector field in the neighbourhood of a magnet, electric current, or changing electric field, in which magnetic forces are observable. A field line is a graphical visual aid for visualizing vector fields. The strength of the magnetic field is called flux density and is denoted by the letter b. Magnetic field lines have several hardandfast rules. His theory predicts that electricity, light, and gravity have finite propagation delays. Magnetic force between two currents going in opposite directions. Magnetic lines of force are used to represent a magnetic field. Magnetic field sources are essentially dipolar in nature, having a north and south magnetic pole. Magnetic field lines show magnitude and direction of the magnetic field. A field line for that vector field may be constructed by starting at a point.
Magnetic field lines are defined to begin on the north pole of a magnet and terminate on the south pole. A magnetic field is an area around a magnet, or something functioning as a magnet, in. Magnetic fields and lines university physics volume 2. The idea of magnetic field lines and magnetic fields was first examined by michael faraday and later by james clerk maxwell. Your fingers curl around the charge in direction of magnetic field lines. Magnetic field is uniform if its magnitude is equal and direction is same at every point in space. L, linea, line, fortis, strong theoretical lines of magnetism that surround a magnet or fill a magnetic field. Magnetic field strength is one of two ways that the intensity of a magnetic field can be expressed. Magnetic field definition, history, illustration, origin, faqs byjus. A graphical representation of the magnitude and the direction of a magnetic field. Magnetic fields such as that of earth cause magnetic compass needles and other permanent magnets to line up in the direction of the field. Imaginary lines that indicate the strength and direction of a magnetic field. Furthermore, the magnetic flux density tends to diminish with increasing distance from a straight currentcarrying wire or a straight line which connects a pair of magnetic poles. They show the direction and strength of magnetic field.
And therefore by definition the magnetic field at this point is in this direction. The start point of the field lines is at the positive charge and end at the negative charge. The magnetic field strength the magnetic flux density can be defined using the force felt by a particle of charge travelling through it at a velocity if the magnetic field is perpendicular to the direction of particles motion, then we have, if the term magnetic field is used to refer to a quantity rather than a region, it is most likely referring to the magnetic field strength. Science physics magnetic forces, magnetic fields, and faradays law magnetic field created by a current magnetic field created by a current this is the currently selected item. Magnetic field lines show magnitude and direction of the magnetic field when the lines of the magnetic field are close together the magnetic field is strong. Field lines further away from the wire are drawn further apart as the field is weaker.
Magnetic field definition of magnetic field by merriamwebster. The path along which north pole moves in a magnetic field is called magnetic lines of force or magnetic field line. At all times the direction of the magnetic field is shown by the direction of the magnetic flux lines. Magnetism is induced in some materials when placed in a magnetic field.
The interaction of magnetic field with charge leads to many practical applications. A magnetic field line or magnetic flux line shows the direction of a magnets force and the strength of a magnet. A small compass will point in the direction of the field line. The magnetic field is an abstract entity that describes the influence of magnetic forces in a region. The lines show the direction of the force that would act on a small n pole placed at any point in the field, so the arrows on the lines always point away from. Curved lines used to represent a magnetic field, drawn such that the number of lines relates to the magnetic fields strength at a given. Furthermore, the tangent of any curve at a particular point is along the direction of the magnetic force at that point. Magnetic field lines inside the magetic field are the imaginary lines along which a hypothetical north pole moves.
Faraday introduced the idea of flux lines to simplify the analysis of magnetic fields. Electric field lines definition, properties, attraction. An advantage of using magnetic field lines as a representation is that many laws of magnetism and electromagnetism can be stated completely and concisely using simple concepts such as the number of field lines through a surface. Magnetic field lines magnets gcse physics single science. Magnetic field lines einstein is said to have been fascinated by a compass as a child, perhaps musing on how the needle felt a force without direct physical contact. The magnetic field b is defined in terms of force on moving charge in the lorentz force law. Lets explore what magnetic field lines are, why we draw them, and what their. Geomagnetic field, magnetic field associated with earth. May 10, 2020 magnetic field lines can never cross, meaning that the field is unique at any point in space. The direction of the magnetic field is tangent to the field line at any point in space. It explains how the magnetic field occurs and how a magnetic field is. Magnetic field simple english wikipedia, the free encyclopedia.
Magnetic fields and magnetic field lines physics lumen learning. Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. Magnetic field lines moves from north to south pole outside the magnet and south to north pole i. In a bar magnet, the magnetic field lines look like. Magnetic field and field lines class 10, magnetic effects. Magnetic field lines are continuous and unbroken, forming closed loops. The field lines emerge from the north pole n, loop around to the south pole s, and continue through the bar magnet back to the north pole. Magnetic field lines can never cross, meaning that the field is unique at any point in space. The magnetic field is the area around a magnet in which there is magnetic force. Magnetic field lines definition, properties, how to draw. A magnetic field line or magnetic flux line shows the direction of a magnets force and the strength of a magnet the idea of lines of force was invented by michael faraday.
A magnetic field is composed of field lines called magnetic flux lines. The magnetic lines of force show where the magnetic field exits the material at one pole and reenters the material at another pole along the length of the magnet. What is a definition of magnetic field lines answers. Magnetic field lines are defined to have the direction that a small compass points when placed at a location. A magnetic field has no sources or sinks gausss law for. Magnetic field lines are circular, centred on the wire. Magnets repel and attract other magnets, and attract magnetic substances. Magnetic field line simple english wikipedia, the free.
Magnetic field lines are like streamlines in fluid flow, in that they represent something continuous, and a different resolution would show more or fewer lines. Magnetic field lines definition by babylons free dictionary. A smaller magnetic field unit is the gauss 1 tesla 10,000 gauss. Magnetic field lines are imaginary lines along which north magnetic pole would move. For the field lines to either start or end at infinity, a single charge must be used. Mar 20, 2019 if magnetic field lines are far from each other in a particular region,then the strength of magnetic field in that region,is very small. One must remember that the field is continuous and exists between, as well as along, the lines of force. The strength of a magnet has to do with the spaces between the magnetic flux lines. Magnetic field strength formula definition, equations. Furthermore, the magnetic flux refers to the total number of magnetic field lines that penetrate an area.
Because monopoles are not found to exist in nature, we also discuss alternate means to describe the field lines in the sections. Oct 07, 2015 the main difference between magnetic field and magnetic flux is that magnetic field is a region where magnetic poles and moving charges experience a force. Away from the surface the dipole becomes distorted. Magnetic field lines naturally bunch together in regions where the magnetic field is the.
Magnetic field lines are a visual tool used to represent magnetic fields. Magnetic force between two currents going in the same direction. Technically, a distinction is made between magnetic field strength h, measured in amperes per meter am, and magnetic flux density b, measured in newtonmeters per ampere nma, also called tesla s t. The lines are drawn closer together where the field is stronger. An advantage of using magnetic field lines as a representation is that many laws of magnetism and electromagnetism can be stated completely and concisely using simple concepts such as. Magnetic field lines are continuous, forming closed loops without a beginning or end. Magnetic field definition, history, illustration, origin, faqs. Electric field lines always point away from a positive charge and towards a negative point. Magnetic lines of force magnetic field electrical academia.
Field line definition of field line by the free dictionary. The tesla is defined in terms of how much force is applied to a moving. Magnetic field definition and meaning collins english. Magnetic field definition, history, illustration, origin. Magnetic fields are different from electric fields. Magnetic lines of force dictionary definition magnetic. The moving charge carrier and magnet produce magnetic flux lines, and these lines are called magnetic field lines. A magnetic field is represented by a series of lines around a magnet. Field line definition, an imaginary line or curve in a field of force, as an electric field, such that the direction of the line at any point is that of the force in the field at that point.
The strength of a magnet has to do with the spaces. These lines are continuous, forming closed loops that run from north to south, and looping around again. Magnetic field is the space around the magnet where its magnetic power or influence can be detected. Magnetic line of force is defined as the closed continuous curve in a magnetic field along which the north pole will move if free to do so, and its direction is given by the direction in which the isolated north pole will point.
Apr 30, 2020 magnetic field is the region in which the magnets show their properties. Both of these english scientists made great discoveries in the field of electromagnetism. We neednt draw infinite lines but just relative amounts. Magnetic field lines depict the strength of the magnetic field, dense lines in a region imply a strong field. A uniform magnetic field is represented by equallyspaced, parallel straight lines. It can be defined as curved lines used to represent a magnetic field. It is a vector quantity because it has both magnitude and direction. Magnetic field of a point charge moving with constant velocity 2 0. The orientation of the line and an arrow show the direction of the field.
873 1247 136 169 922 78 533 1104 461 490 889 15 1290 292 894 1337 405 837 310 467 834 1268 830 1046 1300 1526 141 573 191 1022 1241 1384 1041 505 394