1.
APPLIED
PHYSICS

2.
Ali Nadeem
ADP – IT
Muhammad Ali
ADP – CS
Saad Sharjeel
ADP – IT
Syed Burhan Shah
ADP – IT
PRESENTED BY

3.
•TOPIC
1. Ampere's Circuital Law
2. Limitations of Ampere’s Circuital Law
3. Applications of Ampere’s Circuital Law
PRESENTATION

4.
•AMPERE’S CIRCUITAL LAW:
“The magnetic field
created by an electric
current is proportional to
the size of that electric
current with a constant
of proportionality equal
to the permeability of
free space.”

5.
•EQUATION OF (A.C.L):
∫B. dl = line integral of B around a closed path.
μ0 =Permeability of free space=4 π × 10-15 N/ A2
I = Current.
B = Magnetic Field.

6.
•APPLICATION OF (A.C.L.):
Finding the magnetic field due to infinite straight wire
by using Ampere circuital law:
We'll find the magnetic field at a point
due to a long straight current carrying
conductor.
For this we imagine an Ampere an loop
which is circular with the centre at the
wire and passing through the point P.
∫B .d l=μ0​I
Since the path is a circle, the magnetic field intensity B is uniform
throughout because every point is equidistant.
μ0​I=B .∫ dl=B×2πr
(∫dl=2πr)
∴B=μ0​I/2πr ​= μ0/4π . 2I/r​

7.
•What is the main application of
ampere’s circuital law?
Ampere’s circuital law has
many applications in
calculating magnetic field
at any point due to
current-carrying wire,
current-carrying solenoid,
and toroid.

8.
•Application of ampere’s circuital law:
1. Magnetic field due to a
current-carrying long wire.
2. Magnetic field due to the
Long current-carrying
solenoid.
3. Magnetic field due to
current carrying Toroid.

9.
•LIMITATIONS OF AMPERE’S CIRCUITAL LAW:
Ampere's Law is only
applicable
for constant current or
when the electric field does
not vary with time,
according to James Clerk
Maxwell.
Consider a parallel plate capacitor being charged by a
battery to demonstrate the discrepancy. Time-varying
current travels across connected wires during charging.

10.
•MAIN LIMITATIONS OF (A.C.L.):
The main limitation of Ampere's circuital law is that its
only applicable in Magneto-statics or its only valid
for the steady current.
i.e., the electric field does not change with time.
However, Maxwell modified Ampere's law by
introducing displacement current.

11.
HAVE A
NICE DAY