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Lecture 11.2
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Magnetic Fields Lines - General Physics II - Lecture Notes | PHY 212, Study notes of Physics
Material Type: Notes; Class: General Physics II; Subject: Physics; University: Syracuse University; Term: Unknown 2008;
Typology: Study notes
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Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Lecture 11.
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Review of Last Lecture
Model of Magnetism:
- Magnets• There is non magnetic monopole• Magnetic field exerts torque and force on magnets• Magnets (magnetic dipoles) creates magnetic field
moving charges
Biot-Savart Law:
Magnetic field by a straight current line:
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Magnetic Field Lines
Electric field can be represented by field lines:
charge.Field lines start from +charge, terminate at –
Field is tangent to field line everywhere
densityMagnitude of field is proportional to field line
lines:Magnetic field can also be represented by field
No magnetic monopole
must form closed loop.Hence magnetic field line can not stop. They
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Magnetic Gauss’ Law
surface.Flux: vector integral of field over a
field line piercing the surface.Flux measure the total number of
surface always vanishes.The magnetic flux through a closed
surface always vanishes.Integral of B field over a closed
- (Only work for static magnetic field) (monopole)that there is no magnetic chargeThis is equivalent to the statement
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Magnetic Dipoles
The magnetic dipole moment area of a current loop enclosing an A is defined as dipole moment are A mThe SI units of the magnetic 2
. The dipole ison-axis field of a magnetic
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Addison-Wesley.
Tactics: Evaluating line integrals
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Ampère’s law
Whenever total current I through by apasses through an area bounded closed curve, the line Ampère’s law:around the curve is given byintegral of the magnetic field
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