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Magnetostatics Magnetostatics
nn Magnetostatics Magnetostatics is the branch of electromagnetics is the branch of electromagnetics
dealing with the effects of electric charges in steady dealing with the effects of electric charges in steady
motion (i.e, steady current or DC). motion (i.e, steady current or DC).
nn The fundamental law of The fundamental law of magnetostatics magnetostatics is is
Ampere’s law of force Ampere’s law of force..
nn Ampere’s law of force Ampere’s law of force is analogous to is analogous to Coulomb’s Coulomb’s
law law in electrostatics. in electrostatics.
Page 2


1
Magnetostatics Magnetostatics
nn Magnetostatics Magnetostatics is the branch of electromagnetics is the branch of electromagnetics
dealing with the effects of electric charges in steady dealing with the effects of electric charges in steady
motion (i.e, steady current or DC). motion (i.e, steady current or DC).
nn The fundamental law of The fundamental law of magnetostatics magnetostatics is is
Ampere’s law of force Ampere’s law of force..
nn Ampere’s law of force Ampere’s law of force is analogous to is analogous to Coulomb’s Coulomb’s
law law in electrostatics. in electrostatics.
2
Magnetostatics (Cont’d) Magnetostatics (Cont’d)
nn In magnetostatics, the magnetic field is In magnetostatics, the magnetic field is
produced by steady currents.  The produced by steady currents.  The
magnetostatic field does not allow for magnetostatic field does not allow for
nn inductive coupling between circuits inductive coupling between circuits
nn coupling between electric and magnetic fields coupling between electric and magnetic fields
Page 3


1
Magnetostatics Magnetostatics
nn Magnetostatics Magnetostatics is the branch of electromagnetics is the branch of electromagnetics
dealing with the effects of electric charges in steady dealing with the effects of electric charges in steady
motion (i.e, steady current or DC). motion (i.e, steady current or DC).
nn The fundamental law of The fundamental law of magnetostatics magnetostatics is is
Ampere’s law of force Ampere’s law of force..
nn Ampere’s law of force Ampere’s law of force is analogous to is analogous to Coulomb’s Coulomb’s
law law in electrostatics. in electrostatics.
2
Magnetostatics (Cont’d) Magnetostatics (Cont’d)
nn In magnetostatics, the magnetic field is In magnetostatics, the magnetic field is
produced by steady currents.  The produced by steady currents.  The
magnetostatic field does not allow for magnetostatic field does not allow for
nn inductive coupling between circuits inductive coupling between circuits
nn coupling between electric and magnetic fields coupling between electric and magnetic fields
3
Ampere’s Law of Force Ampere’s Law of Force
nn Ampere’s law of force Ampere’s law of force is the “law of action” is the “law of action”
between current carrying circuits. between current carrying circuits.
nn Ampere’s law of force Ampere’s law of force gives the magnetic force gives the magnetic force
between two between two current carrying circuits current carrying circuits in an in an
otherwise empty universe. otherwise empty universe.
nn Ampere’s law of force involves complete circuits Ampere’s law of force involves complete circuits
since current must flow in closed loops. since current must flow in closed loops.
Page 4


1
Magnetostatics Magnetostatics
nn Magnetostatics Magnetostatics is the branch of electromagnetics is the branch of electromagnetics
dealing with the effects of electric charges in steady dealing with the effects of electric charges in steady
motion (i.e, steady current or DC). motion (i.e, steady current or DC).
nn The fundamental law of The fundamental law of magnetostatics magnetostatics is is
Ampere’s law of force Ampere’s law of force..
nn Ampere’s law of force Ampere’s law of force is analogous to is analogous to Coulomb’s Coulomb’s
law law in electrostatics. in electrostatics.
2
Magnetostatics (Cont’d) Magnetostatics (Cont’d)
nn In magnetostatics, the magnetic field is In magnetostatics, the magnetic field is
produced by steady currents.  The produced by steady currents.  The
magnetostatic field does not allow for magnetostatic field does not allow for
nn inductive coupling between circuits inductive coupling between circuits
nn coupling between electric and magnetic fields coupling between electric and magnetic fields
3
Ampere’s Law of Force Ampere’s Law of Force
nn Ampere’s law of force Ampere’s law of force is the “law of action” is the “law of action”
between current carrying circuits. between current carrying circuits.
nn Ampere’s law of force Ampere’s law of force gives the magnetic force gives the magnetic force
between two between two current carrying circuits current carrying circuits in an in an
otherwise empty universe. otherwise empty universe.
nn Ampere’s law of force involves complete circuits Ampere’s law of force involves complete circuits
since current must flow in closed loops. since current must flow in closed loops.
4
Ampere’s Law of Force (Cont’d) Ampere’s Law of Force (Cont’d)
nn Experimental facts: Experimental facts:
nn Two parallel wires Two parallel wires
carrying current in the carrying current in the
same direction attract. same direction attract.
nn Two parallel wires Two parallel wires
carrying current in the carrying current in the
opposite directions opposite directions
repel. repel.
´ ´
I
1
I
2
F
12
F
21
´ ·
I
1
I
2
F
12 F
21
Page 5


1
Magnetostatics Magnetostatics
nn Magnetostatics Magnetostatics is the branch of electromagnetics is the branch of electromagnetics
dealing with the effects of electric charges in steady dealing with the effects of electric charges in steady
motion (i.e, steady current or DC). motion (i.e, steady current or DC).
nn The fundamental law of The fundamental law of magnetostatics magnetostatics is is
Ampere’s law of force Ampere’s law of force..
nn Ampere’s law of force Ampere’s law of force is analogous to is analogous to Coulomb’s Coulomb’s
law law in electrostatics. in electrostatics.
2
Magnetostatics (Cont’d) Magnetostatics (Cont’d)
nn In magnetostatics, the magnetic field is In magnetostatics, the magnetic field is
produced by steady currents.  The produced by steady currents.  The
magnetostatic field does not allow for magnetostatic field does not allow for
nn inductive coupling between circuits inductive coupling between circuits
nn coupling between electric and magnetic fields coupling between electric and magnetic fields
3
Ampere’s Law of Force Ampere’s Law of Force
nn Ampere’s law of force Ampere’s law of force is the “law of action” is the “law of action”
between current carrying circuits. between current carrying circuits.
nn Ampere’s law of force Ampere’s law of force gives the magnetic force gives the magnetic force
between two between two current carrying circuits current carrying circuits in an in an
otherwise empty universe. otherwise empty universe.
nn Ampere’s law of force involves complete circuits Ampere’s law of force involves complete circuits
since current must flow in closed loops. since current must flow in closed loops.
4
Ampere’s Law of Force (Cont’d) Ampere’s Law of Force (Cont’d)
nn Experimental facts: Experimental facts:
nn Two parallel wires Two parallel wires
carrying current in the carrying current in the
same direction attract. same direction attract.
nn Two parallel wires Two parallel wires
carrying current in the carrying current in the
opposite directions opposite directions
repel. repel.
´ ´
I
1
I
2
F
12
F
21
´ ·
I
1
I
2
F
12 F
21
5
Ampere’s Law of Force (Cont’d) Ampere’s Law of Force (Cont’d)
nn Experimental facts: Experimental facts:
nn A short current A short current- -
carrying wire oriented carrying wire oriented
perpendicular to a perpendicular to a
long current long current- -carrying carrying
wire experiences no wire experiences no
force. force.
´
I
1
F
12
= 0
I
2
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FAQs on PPT: Magnetostatics - Electromagnetic Fields Theory (EMFT) - Electrical Engineering (EE)

1. What is magnetostatics?
Ans. Magnetostatics is a branch of physics that deals with the study of magnetic fields and their effects on stationary electric charges and currents.
2. What are the key principles of magnetostatics?
Ans. The key principles of magnetostatics include the Biot-Savart law, Ampere's law, and the concept of magnetic flux density (B-field). These principles help in understanding and calculating magnetic fields produced by current-carrying conductors.
3. How is magnetostatics different from magnetodynamics?
Ans. Magnetostatics deals with magnetic fields in the absence of time-varying electric fields or currents, while magnetodynamics considers the effects of time-varying electric fields and currents on magnetic fields. In magnetostatics, the magnetic fields are assumed to be constant or in equilibrium.
4. What are some applications of magnetostatics in everyday life?
Ans. Magnetostatics has various practical applications, including the operation of electric motors and generators, magnetic levitation systems (such as Maglev trains), magnetic resonance imaging (MRI) in medical diagnostics, and magnetic data storage devices (like hard drives).
5. How is magnetostatics related to electromagnetism?
Ans. Magnetostatics is a subset of electromagnetism, which encompasses the study of both electric and magnetic fields. While magnetostatics focuses on the behavior of magnetic fields, electromagnetism considers the interaction between electric and magnetic fields, as well as the generation of electric fields by time-varying magnetic fields (Faraday's law).
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