The document discusses electromagnetic induction and its related concepts. It covers:
1. Faraday's experiments which established that a changing magnetic flux induces an electromotive force (emf) in conductors.
2. Faraday's laws of induction which state that an emf is induced whenever the magnetic flux through a circuit changes, and the magnitude of the induced emf is proportional to the rate of change of flux.
3. Lenz's law which describes the direction of the induced current: it will oppose the change producing it in order to conserve energy.
Methods to induce emf by changing the magnetic flux include changing the magnetic field strength, changing the area of a coil, and changing the coil's
This Presentation gives a basic idea about Electromagnetic induction,Faraday's Law ,Lenz's law and the application of Electromagnetic Induction. I included some real life examples of electromagnetic induction also. I hope everyone will like it
As electric field, that is, force per unit charge is a vector quantity; it can be used to represent overall effect of electric field in system of electric charges. Similarly electric field can be used in pictorial form to describe the overall intensity of the field. Copy the link given below and paste it in new browser window to get more information on Electric Field Lines www.askiitians.com/iit-jee-electrostatics/electric-field-lines/
This Presentation gives a basic idea about Electromagnetic induction,Faraday's Law ,Lenz's law and the application of Electromagnetic Induction. I included some real life examples of electromagnetic induction also. I hope everyone will like it
As electric field, that is, force per unit charge is a vector quantity; it can be used to represent overall effect of electric field in system of electric charges. Similarly electric field can be used in pictorial form to describe the overall intensity of the field. Copy the link given below and paste it in new browser window to get more information on Electric Field Lines www.askiitians.com/iit-jee-electrostatics/electric-field-lines/
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A few basics about magnetism and Alternating currents.
Students of APJ Abdul Kalam Technological University (KTU) may find this helpful for their second module for the subject EE100 BASICS OF ELECTRICAL ENGINEERING.
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1. ELECTROMAGNETIC INDUCTION
1. Magnetic Flux
2. Faradayās Experiments
3. Faradayās Laws of Electromagnetic Induction
4. Lenzās Law and Law of Conservation of Energy
5. Expression for Induced emf based on both laws
6. Methods of producing induced emf
a) By changing Magnetic Field
b) By changing the Area of the Coil (Motional emf)
c) By changing the Relative Orientation of the coil with
the Magnetic Field
7. Eddy Currents
8. Self Induction and Self Inductance
9. Mutual Induction and Mutual Inductance
10. Additional Information
2. Īø
Magnetic Flux (Ī¦):
Magnetic Flux through any surface is the number of magnetic lines of force
passing normally through that surface.
It can also be defined as the product of the area of the surface and the
component of the magnetic field normal to that surface.
ds
n
B
B cos Īø
dĪ¦ = B . ds cos Īø
Ī¦ = B . A = B.A.n
Ī¦ = B . A cos Īø
Positive Flux:
Magnetic Flux is positive for 0Ā° ā¤ Īø < 90Ā° & 270Ā° < Īø ā¤ 360Ā°
Zero Flux:
Magnetic Flux is zero for Īø = 90Ā° & Īø = 270Ā°
Negative Flux:
Magnetic Flux is negative for 90Ā° < Īø < 270Ā°
Direction of ds is
along the normal to
the surface and
is unit normal
vector.
n
n
dĪ¦ = B . ds = B.ds.
Flux is maximum
when Īø = 0Ā° and is
Ī¦ = B . A
3. * Magnetic flux is a scalar quantity.
* SI unit of magnetic flux is weber or tesla-metre2 or ( wb or Tm2).
* cgs unit of magnetic flux is maxwell.
* 1 maxwell = 10-8 weber
* Magnetic flux (associated normally) per unit area is called Magnetic
Flux Density or Strength of Magnetic Field or Magnetic Induction (B).
Magnetic Flux across a coil can be changed by changing :
1) the strength of the magnetic field B
2) the area of cross section of the coil A
3) the orientation of the coil with magnetic field Īø or
4) any of the combination of the above
Ī¦ = B . A cos Īø
5. Magnetic flux linked with the coil changes relative to the
positions of the coil and the magnet due to the magnetic lines of
force cutting at different angles at the same cross sectional area
of the coil.
N
S
N S
G
6. Observe:
i) the relative motion between the coil and the magnet
ii) the induced polarities of magnetism in the coil
iii) the direction of current through the galvanometer and hence the
deflection in the galvanometer
iv) that the induced current (e.m.f) is available only as long as there is
relative motion between the coil and the magnet
Note: i) coil can be moved by fixing the magnet
ii) both the coil and magnet can be moved ( towards each other or
away from each other) i.e. there must be a relative velocity between
them
iii) magnetic flux linked with the coil changes relative to the positions
of the coil and the magnet
iv) current and hence the deflection is large if the relative velocity
between the coil and the magnet and hence the rate of change of
flux across the coil is more
7. E G
N S N
S
K
Faradayās Experiment - 2:
E G
N S
K
N S
When the primary circuit is closed
current grows from zero to
maximum value.
During this period changing,
current induces changing
magnetic flux across the primary
coil.
This changing magnetic flux is
linked across the secondary coil
and induces e.m.f (current) in the
secondary coil.
Induced e.m.f (current) and hence
deflection in galvanometer lasts
only as long as the current in the
primary coil and hence the
magnetic flux in the secondary
coil change.
P
P
S
S
8. When the primary circuit is open current decreases from maximum value to
zero.
During this period changing current induces changing magnetic flux across the
primary coil.
This changing magnetic flux is linked across the secondary coil and induces
current (e.m.f) in the secondary coil.
However, note that the direction of current in the secondary coil is reversed
and hence the deflection in the galvanometer is opposite to the previous case.
Faradayās Laws of Electromagnetic Induction:
I Law:
Whenever there is a change in the magnetic flux linked with a circuit, an emf
and hence a current is induced in the circuit. However, it lasts only so long
as the magnetic flux is changing.
II Law:
The magnitude of the induced emf is directly proportional to the rate of
change of magnetic flux linked with a circuit.
E Ī± dĪ¦ / dt E = k dĪ¦ /
dt
(where k is a constant and units are chosen such that k = 1)
E = dĪ¦ / dt E = (Ī¦2 ā Ī¦1) / t
9. Lenzās Law:
The direction of the induced emf or induced current is such that it opposes
the change that is producing it.
i.e. If the current is induced due to motion of the magnet, then the induced
current in the coil sets itself to stop the motion of the magnet.
If the current is induced due to change in current in the primary coil, then
induced current is such that it tends to stop the change.
Lenzās Law and Law of Conservation of Energy:
According to Lenzās law, the induced emf opposes the change that produces
it. It is this opposition against which we perform mechanical work in causing
the change in magnetic flux. Therefore, mechanical energy is converted into
electrical energy. Thus, Lenzās law is in accordance with the law of
conservation of energy.
If, however, the reverse would happen (i.e. the induced emf does not oppose
or aids the change), then a little change in magnetic flux would produce an
induced current which would help the change of flux further thereby
producing more current. The increased emf would then cause further change
of flux and it would further increase the current and so on. This would create
energy out of nothing which would violate the law of conservation of energy.
10. Expression for Induced emf based on both the laws:
E = - dĪ¦ / dt
E = - (Ī¦2 ā Ī¦1) / t
And for āNā no. of turns of the coil,
E = - N dĪ¦ / dt
E = - N (Ī¦2 ā Ī¦1) / t
Expression for Induced current:
I = - dĪ¦ / (R dt)
Expression for Charge:
dq / dt = - dĪ¦ / (R dt)
dq = - dĪ¦ / R
Note:
Induced emf does not depend on
resistance of the circuit where as
the induced current and induced
charge depend on resistance.
Methods of producing Induced emf:
1. By changing Magnetic Field B:
Magnetic flux Ī¦ can be changed by changing the magnetic field B and
hence emf can be induced in the circuit (as done in Faradayās
Experiments).
11. 2. By changing the area of the coil A available in Magnetic Field:
Magnetic flux Ī¦ can be changed by changing the area of the loop A
which is acted upon by the magnetic field B and hence emf can be
induced in the circuit.
P Q
S R
Pā Qā
Sā Rā
v
B
dA
The loop PQRS is slided into uniform and perpendicular
magnetic field. The change (increase) in area of the coil
under the influence of the field is dA in time dt. This
causes an increase in magnetic flux dĪ¦.
l
v.dt
dĪ¦ = B.dA
= B.l.v.dt
E = - dĪ¦ / dt
E = - Blv
The induced emf is due to motion of the loop and so it is called āmotional emfā.
If the loop is pulled out of the magnetic field, then E = Blv
The direction of induced current is anticlockwise in the loop. i.e. PāSāRāQāPā by
Flemingās Right Hand Rule or Lenzās Rule.
I
12. According Lenzās Rule, the direction of induced current is such that it
opposes the cause of changing magnetic flux.
Here, the cause of changing magnetic flux is due to motion of the loop and
increase in area of the coil in the uniform magnetic field.
Therefore, this motion of the loop is to be opposed. So, the current is setting
itself such that by Flemingās Left Hand Rule, the conductor arm PS
experiences force to the right whereas the loop is trying to move to the left.
Against this force, mechanical work is done which is converted into electrical
energy (induced current).
NOTE: If the loop is completely inside the boundary of magnetic field, then
there will not be any change in magnetic flux and so there will not be induced
current in the loop.
Electric
Current
(I)
Force
(F)
Magnetic
Field
(B)
Flemingās Right Hand Rule:
If the central finger, fore finger and thumb
of right hand are stretched mutually
perpendicular to each other and the fore
finger points to magnetic field, thumb
points in the direction of motion (force),
then central finger points to the direction of
induced current in the conductor.
13. 3. By changing the orientation of the coil (Īø) in Magnetic Field:
Magnetic flux Ī¦ can be changed by changing the relative orientation of the
loop (Īø) with the magnetic field B and hence emf can be induced in the
circuit.
P
Q
R
S
B
Īø
Ļ
Ī¦ = N B A cos Īø
At time t, with angular velocity Ļ,
Īø = Ļt (at t = 0, loop is assumed to
be perpendicular to the magnetic field
and Īø = 0Ā°)
Ī¦ = N B A cos Ļt
Differentiating w.r.t. t,
dĪ¦ / dt = - NBAĻ sin Ļt
E = - dĪ¦ / dt
E = NBAĻ sin Ļt
E = E0 sin Ļt (where E0 = NBAĻ is
the maximum emf)
n
14. The emf changes continuously in
magnitude and periodically in
direction w.r.t. time giving rise to
alternating emf.
If initial position of the coil is taken
as 0Ā°, i.e. normal to the coil is at 90Ā°
with the magnetic field, then
Īø becomes Īø + Ļ/2 or Ļt + Ļ/2
E = E0 cos Ļt
So, alternating emf and
consequently alternating current
can be expressed in sin or cos
function.
This method of inducing emf is the basic principle of generators.
E
E0
T/4 T/2 3T/4 T 5T/4 3T/2 7T/4 2T
t
0
4Ļ
Ļ 2Ļ 3Ļ
Ļ/2 3Ļ/2 5Ļ/2 7Ļ/2 Īø = Ļt
E
E0
T/4 T/2 3T/4 T 5T/4 3T/2 7T/4 2T
t
0
4Ļ
Ļ 2Ļ 3Ļ
Ļ/2 3Ļ/2 5Ļ/2 7Ļ/2 Īø = Ļt
15. Eddy Currents or Foucault Currents:
The induced circulating (looping) currents produced in a solid metal due to
change in magnetic field (magnetic flux) in the metal are called eddy currents.
B
Metallic Block Eddy Currents
Applications of Eddy Currents:
1. In induction furnace eddy currents are
used for melting iron ore, etc.
2. In speedometer eddy currents are used to
measure the instantaneous speed of the
vehicle.
3. In dead beat galvanometer eddy currents
are used to stop the damping of the coil
in a shorter interval.
4. In electric brakes of the train eddy currents are produced to stop the
rotation of the axle of the wheel.
5. In energy meters (watt ā meter) eddy currents are used to measure the
consumption of electric energy.
6. In diathermy eddy currents are used for localised heating of tissues in
human bodies.
16. Self Induction:
Self Induction is the phenomenon of inducing emf in the self coil due to
change in current and hence the change in magnetic flux in the coil.
The induced emf opposes the growth or decay of current in the coil and
hence delays the current to acquire the maximum value.
Self induction is also called inertia of electricity as it opposes the growth or
decay of current.
Self Inductance:
Ī¦ Ī± I or Ī¦ = LI
If I = 1, then L = Ī¦
(where L is the constant of proportionality and is known as
Self Inductance or co-efficient of self induction)
Thus, self inductance is defined as the magnetic flux linked with a coil
when unit current flows through it.
Also, E = - dĪ¦ / dt or E = - L (dI / dt)
If dI / dt = 1, then L = E
Thus, self inductance is defined as the induced emf set up in the coil
through which the rate of change of current is unity.
17. SI unit of self inductance is henry (H).
Self inductance is said to be 1 henry when 1 A current in a coil links magnetic
flux of 1 weber.
or
Self inductance is said to be 1 henry when unit rate of change of current
(1 A / s) induces emf of 1 volt in the coil.
Self inductance of a solenoid:
l
A
I
Magnetic Field due to the solenoid is
B = Ī¼0nI
Magnetic Flux linked across one turn of the
coil is
Ī¦ per turn = B A = Ī¼0nIA = Ī¼0NIA / l
Magnetic Flux linked across N turns of the
coil is
Ī¦ = Ī¼0N2IA / l
But, Ī¦ = LI
So, L = Ī¼0N2A / l = Ī¼0n2Al
Energy in Inductor:
Small work done dW in
establishing a current I in the
coil in time dt is dW = - EI dt
dW = LI dI (since E = -L(dI / dt)
W = ā« L I dI = Ā½ LI0
2
0
I0
18. Mutual Induction:
Mutual Induction is the phenomenon of inducing emf in the secondary coil
due to change in current in the primary coil and hence the change in
magnetic flux in the secondary coil.
Mutual Inductance:
Ī¦21 Ī± I1 or Ī¦21 = MI1
If I1 = 1, then M = Ī¦
(where M is the constant of proportionality and is
known as Mutual Inductance or co-efficient of mutual
induction)
Thus, mutual inductance is defined as the magnetic flux linked with the
secondary coil when unit current flows through the primary coil.
Also, E2 = - dĪ¦21 / dt or E 2= - M (dI1 / dt)
If dI1 / dt = 1, then M = E
Thus, mututal inductance is defined as the induced emf set up in the
secondary coil when the rate of change of current in primary coil is unity.
SI unit of mututal inductance is henry (H).
Mutual inductance is said to be 1 henry when 1 A current in the primary coil
links magnetic flux of 1 weber across the secondary coil. or
Mutual inductance is said to be 1 henry when unit rate of change of current
(1 A / s) in primary coil induces emf of 1 volt in the secondary coil.
19. Mutual inductance of two long co-axial solenoids:
Magnetic Field due to primary solenoid is
B1 = Ī¼0n1I1
Magnetic Flux linked across one turn of the
secondary solenoid is
Ī¦21 per turn = B1 A = Ī¼0n1I1A = Ī¼0N1I1A / l
Magnetic Flux linked across N turns of the secondary
solenoid is
Ī¦21 = Ī¼0N1N2I1A / l
But, Ī¦21 = M21I1
M21 = Ī¼0N1N2A / l = Ī¼0n1n2Al
lllly M12 = Ī¼0N1N2A / l = Ī¼0n1n2Al
A
For two long co-axial solenoids of same length and cross-sectional
area, the mutual inductance is same and leads to principle of
reciprocity.
M = M12 = M21
l
I1
G
P
S
20. Additional Information:
1) If the two solenoids are wound on a magnetic core of relative
permeability Ī¼r, then
M = Ī¼0 Ī¼r N1N2A / l
2) If the solenoids S1 and S2 have no. of turns N1 and N2 of different radii r1
and r2 (r1 < r2), then
M = Ī¼0 Ī¼r N1N2 (Ļr1
2)/ l
3) Mutual inductance depends also on the relative placement of the
solenoids.
4) Co-efficient of Coupling (K) between two coils having self-inductance L1
and L2 and mutual inductance M is
K = M / (āL1L2) Generally, K < 1
5) If L1 and L2 are in series, then L = L1 + L2
6) If L1 and L2 are in parallel, then (1/L) = (1/L1) + (1/L2)