Magnetic field
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials. In everyday life, the effects of magnetic fields are often seen in permanent magnets , which pull on magnetic materials (such as iron ) and attract or repel other magnets. Magnetic fields surround and are created by magnetized material and by moving electric charges ( electric currents ) such as those used in electromagnets . Magnetic fields exert forces on nearby moving electrical charges and torques on nearby magnets. In addition, a magnetic field that varies with location exerts a force on magnetic materials. Both the strength and direction of a magnetic field varies with location. As such, it is an example of a vector field .
Page Revisions
| Year | Metadata | Sections | Top Words | First Paragraph |
| 2018 |
299979 characters 51 sections 142 paragraphs 19 images 336 internal links 69 external links |
2. Definitions, units and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.636 field 0.371 magnet 0.202 electric 0.192 force 0.147 magnets 0.147 currents 0.126 charge 0.114 magnetization 0.111 charges 0.106 equations 0.104 law 0.101 ampère 0.099 vector 0.097 nb 0.093 |
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials. In everyday life, the effects of magnetic fields are often seen in permanent magnets , which pull on magnetic materials (such as iron ) and attract or repel other magnets. Magnetic fields surround and are created by magnetized material and by moving electric charges ( electric currents ) such as those used in electromagnets . Magnetic fields exert forces on nearby moving electrical charges and torques on nearby magnets. In addition, a magnetic field that varies with location exerts a force on magnetic materials. Both the strength and direction of a magnetic field varies with location. As such, it is an example of a vector field . |
| 2017 |
300939 characters 51 sections 145 paragraphs 20 images 332 internal links 65 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.628 field 0.375 magnet 0.220 electric 0.186 force 0.153 magnets 0.142 currents 0.118 charge 0.118 charges 0.106 magnetization 0.106 equations 0.105 law 0.102 vector 0.101 ampère 0.099 nb 0.093 |
A magnetic field is a force field that is created by moving electric charges ( electric currents ) and magnetic dipoles , and exerts a force on other nearby moving charges and magnetic dipoles. At any given point, it has a direction and a magnitude (or strength), so it is represented by a vector field . The term is used for two distinct but closely related fields denoted by the symbols B and H , where, in the International System of Units , H is measured in units of amperes per meter and B is measured in teslas or newtons per meter per ampere. In a vacuum , B and H are the same aside from units; but in a material with a magnetization (denoted by the symbol M ), B is solenoidal (having no divergence in its spatial dependence) while H is irrotational ( curl -free). |
| 2016 |
289540 characters 51 sections 144 paragraphs 19 images 330 internal links 64 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.630 field 0.374 magnet 0.219 electric 0.189 force 0.148 magnets 0.142 charge 0.124 currents 0.118 equations 0.105 law 0.101 charges 0.101 vector 0.101 magnetization 0.100 nb 0.099 ampère 0.099 |
A magnetic field is the magnetic effect of electric currents and magnetic materials . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The term is used for two distinct but closely related fields denoted by the symbols B and H , where H is measured in units of amperes per meter (symbol: A⋅m −1 or A/m) in the SI . B is measured in teslas (symbol: T) and newtons per meter per ampere (symbol: N⋅m −1 ⋅A −1 or N/(m⋅A)) in the SI . B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. |
| 2015 |
289550 characters 51 sections 143 paragraphs 19 images 332 internal links 63 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.628 field 0.373 magnet 0.220 electric 0.186 force 0.148 magnets 0.142 charge 0.125 currents 0.118 ampère 0.112 equations 0.105 law 0.104 charges 0.101 vector 0.101 magnetization 0.100 nb 0.099 |
A magnetic field is the magnetic effect of electric currents and magnetic materials . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The term is used for two distinct but closely related fields denoted by the symbols B and H , where H is measured in units of amperes per meter (symbol: A·m −1 or A/m) in the SI . B is measured in teslas (symbol:T) and newtons per meter per ampere (symbol: N·m −1 ·A −1 or N/(m·A)) in the SI . B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. |
| 2014 |
282480 characters 51 sections 142 paragraphs 16 images 327 internal links 59 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.627 field 0.371 magnet 0.220 electric 0.187 force 0.148 magnets 0.143 charge 0.125 currents 0.118 ampère 0.113 equations 0.105 law 0.105 charges 0.102 vector 0.102 magnetization 0.101 nb 0.100 |
A magnetic field is the magnetic influence of electric currents and magnetic materials . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The term is used for two distinct but closely related fields denoted by the symbols B and H , where H is measured in units of amperes per meter (symbol: A·m −1 or A/m) in the SI . B is measured in teslas (symbol: T) and newtons per meter per ampere (symbol: N·m −1 ·A −1 or N/(m·A)) in the SI . B is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. |
| 2013 |
277384 characters 50 sections 142 paragraphs 16 images 325 internal links 52 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.634 field 0.369 magnet 0.210 electric 0.188 force 0.152 magnets 0.141 charge 0.127 ampère 0.118 currents 0.117 equations 0.109 law 0.107 vector 0.101 charges 0.096 maxwell 0.096 nb 0.093 |
A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The term is used for two distinct but closely related fields denoted by the symbols B and H . B refers to magnetic flux density, and H to magnetic field strength. Magnetic flux density is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. |
| 2012 |
274348 characters 47 sections 145 paragraphs 16 images 320 internal links 52 external links |
2. Definitions, units, and measurement 4. Magnetic field and permanent magnets 5. Magnetic field and electric currents 6. Relation between <b>H</b> and <b>B</b> 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.629 field 0.373 magnet 0.212 electric 0.190 force 0.153 magnets 0.143 charge 0.125 ampère 0.119 currents 0.118 equations 0.110 law 0.108 vector 0.097 charges 0.097 maxwell 0.097 nb 0.094 |
A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The magnetic field is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. Magnetic field can refer to two separate but closely related fields which are denoted by the symbols B and H . |
| 2011 |
268478 characters 44 sections 142 paragraphs 17 images 324 internal links 46 external links |
2. Definitions, units, and measurement 4. The magnetic field and permanent magnets 5. The magnetic field and electric currents 6. The relation between <i>H</i> and <i>B</i> 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.638 field 0.390 magnet 0.224 electric 0.189 magnets 0.142 force 0.131 currents 0.122 equations 0.115 charge 0.111 charges 0.106 maxwell 0.101 current 0.096 lines 0.096 law 0.096 nb 0.093 |
A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The magnetic field is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. There are two separate but closely related fields to which the name 'magnetic field' can refer: a magnetic B field and a magnetic H field. |
| 2010 |
250974 characters 40 sections 138 paragraphs 13 images 321 internal links 40 external links |
2. Definitions, units, and measurement 4. The magnetic field and permanent magnets 5. The magnetic field and electric currents 6. <i>H</i> and <i>B</i> inside and outside of magnetic materials 7. Energy stored in magnetic fields 8. Electromagnetism: the relationship between magnetic and electric fields |
magnetic 0.600 field 0.417 magnet 0.276 electric 0.171 charges 0.138 magnets 0.135 charge 0.124 equations 0.122 currents 0.116 lines 0.115 force 0.113 maxwell 0.109 magnetization 0.102 nb 0.095 vector 0.095 |
A magnetic field is a field of force produced by moving electric charges , by electric fields that vary in time , and by the 'intrinsic' magnetic field of elementary particles associated with the spin of the particle. There are two separate but closely related fields to which the name 'magnetic field' can refer: a magnetic B field and a magnetic H field. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [nb 1] The magnetic field is most commonly defined in terms of the Lorentz force it exerts on moving electric charges. |
| 2009 |
249474 characters 39 sections 133 paragraphs 11 images 329 internal links 44 external links |
2. The magnetic field and permanent magnets 3. Visualizing the magnetic field using field lines 4. The magnetic field and electrical currents 5. <i>H</i> and <i>B</i> inside and outside of magnetic materials 6. Energy stored in magnetic fields 7. Electromagnetism: the relationship between magnetic and electric fields 8. Measuring the <i>B</i>-field |
magnetic 0.619 field 0.402 magnet 0.250 electric 0.158 force 0.151 charge 0.139 charges 0.133 magnets 0.118 magnetization 0.112 loop 0.101 currents 0.097 vector 0.093 current 0.091 fields 0.088 pole 0.088 |
Magnetic fields surround magnetic materials and electric currents and are detected by the force they exert on other magnetic materials and moving electric charges . The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field . [1] |
| 2008 |
221859 characters 42 sections 96 paragraphs 10 images 240 internal links 25 external links |
2. Permanent magnets and magnetic poles 3. Visualizing the magnetic field 4. Effects of the magnetic field, B 6. Definition and mathematical properties of B 7. Measuring the magnetic B field 10. Special relativity and electromagnetism |
magnetic 0.574 mathbf 0.501 field 0.343 displaystyle 0.330 magnet 0.177 electric 0.112 loops 0.090 force 0.089 currents 0.088 current 0.082 charge 0.081 loop 0.073 fields 0.070 direction 0.068 lines 0.064 |
In physics , a magnetic field is a vector field that permeates space and which can exert a magnetic force on moving electric charges and on magnetic dipoles (such as permanent magnets). When placed in a magnetic field, magnetic dipoles tend to align their axes to be parallel with the magnetic field, as can be seen when iron filings are in the presence of a magnet (see picture at right). In addition, a changing magnetic field can induce an electric field . Magnetic fields surround and are created by electric currents , magnetic dipoles, and changing electric fields . Magnetic fields also have their own energy , with an energy density proportional to the square of the field intensity. |
| 2007 |
111665 characters 18 sections 59 paragraphs 6 images 126 internal links 19 external links |
2. Force due to a magnetic field 3. Magnetic field of a steady current 7. Special relativity and electromagnetism |
mathbf 0.573 magnetic 0.436 displaystyle 0.373 field 0.307 vector 0.146 electric 0.142 magnet 0.131 force 0.107 lines 0.102 dipoles 0.082 current 0.075 si 0.073 currents 0.072 direction 0.069 units 0.066 |
In physics , the magnetic field is a field that permeates space and which exerts a magnetic force on moving electric charges and magnetic dipoles . Magnetic fields surround electric currents , magnetic dipoles, and changing electric fields . |
| 2006 |
107534 characters 15 sections 60 paragraphs 6 images 188 internal links 13 external links |
magnetic 0.540 field 0.367 electric 0.243 displaystyle 0.222 lorentz 0.185 currents 0.182 charge 0.174 force 0.165 tesla 0.123 moving 0.119 magnet 0.118 observer 0.115 vector 0.111 rotating 0.106 induction 0.101 |
You must add a
|
|
| 2005 |
79448 characters 13 sections 41 paragraphs 2 images 83 internal links 12 external links |
magnetic 0.458 field 0.263 force 0.236 electric 0.223 mathbf 0.181 displaystyle 0.180 fields 0.162 vector 0.148 observer 0.147 equation 0.146 law 0.129 wire 0.127 repulsive 0.127 electrostatic 0.122 charges 0.116 |
In physics , a magnetic field is an entity produced by moving electric charges ( electric currents ) that exerts a force on other moving charges. (The quantum-mechanical spin of a particle produces magnetic fields and is acted on by them as though it were a current; this accounts for the fields produced by "permanent" ferromagnets .) A magnetic field is a vector field : it associates with every point in space a ( pseudo -) vector that may vary in time. The direction of the field is the equilibrium direction of a compass needle placed in the field. |
|
| 2004 |
28414 characters 4 sections 26 paragraphs 1 images 51 internal links 0 external links |
displaystyle 0.402 magnetic 0.344 mathbf 0.302 electric 0.213 observer 0.211 force 0.203 field 0.183 repulsive 0.181 electrostatic 0.174 maxwell 0.166 vector 0.151 fields 0.143 charges 0.133 moving 0.131 observes 0.120 |
In physics , a magnetic field is an entity produced by moving electric charges ( electric currents ) that exerts a force on other moving charges. (The quantum-mechanical spin of a particle produces magnetic fields and is acted on by them as though it were a current; this accounts for the fields produced by "permanent" ferromagnets .) |
|
| 2003 |
11230 characters 0 sections 9 paragraphs 1 images 37 internal links 0 external links |
magnetic 0.446 maxwell 0.300 field 0.294 vector 0.229 equations 0.207 relativity 0.192 fields 0.162 electric 0.161 gif 0.146 equation 0.136 static 0.136 force 0.128 lorentz 0.125 del 0.125 law 0.124 |
|
|
| 2002 |
850 characters 0 sections 1 paragraphs 0 images 1 internal links 0 external links |
redirect 1.000 |