Name : SUMAN SAHU
Guided By :- Roll : 094052
Regd : 0901287260
Prof. SHIBA PRASAD Branch : EEE
2. MAGNETS & MAGNETISM
3. APPLICATIONS OF MAGNETS
4. RESEARCHS ON MAGNET
5. EARTH AS A MAGNET
We played with magnets as children but the world of
magnets is isn’t kid’s stuff.
They help us to communicate , travel & fabricate.
From the junk yard to outer space, to the cutting edge of
medicine , these amazing forces of attraction & repulsion
are almost everywhere.
They form an integral component of nearly every
object that we use in day to day life & in every field of
engineering like electrical, mechanical ,electronics,
computer science, etc. & also in the medical field.
DISCOVERY OF MAGNETS
A magnet is a material or object that produces a magnetic
field , thus pulling on other ferromagnetic materials such as
IRON & attracts or repels other magnets.
Earth’s only naturally occurring
Discovered about 4000 years ago in
a place called MAGNESIA .
Chemical formula : Fe3O4 .
PROPERTIES OF MAGNETS
1. There are North Poles and South Poles.
2. Like poles repel, unlike poles attract each other.
3. Monopoles never exist.
4. Magnetic poles of a magnet have equal strength.
5. Magnetic forces attract only magnetic materials.
6. If suspended freely , a magnet aligns in north-south
It is a space around a magnet in which the force
of attraction or repulsion on a magnet can be
Types of magnets
Permanent Magnets : Once magnetized , they
retain a certain degree of magnetism.
Ex : AlNiCo magnets , Ferrites
Temporary Magnets : Act as magnets in presence
of a magnetic field but loose their magnetism afterwards.
Ex : Soft iron
Electromagnets : Produced by placing a metal
core inside a coil of wire carrying a electric current.
Ex : Solenoids
Superconductors : Strongest magnets of all.
Used in determining direction.
Compass needles are
magnetized and respond to
the magnetic field of the
Used in past for navigation , especially
during bad weather when there were no
stars or sun visible.
MAGNETICALLY LEVITATED TRAIN.
SPEED AROUND 500-600 KMPH.
FIRST DEVELOPED BY JAPAN IN 1980’s.
USES SUPERCONDUCTING MATERIAL IN THE
USES LINEAR SYNCHRONOUS MOTORS(LSM).
These can transfer torque from one component to
another without any physical contact.
Magnetic Resonance Imaging
In 1940’s it was discovered that the magnetic
fields of even atoms can be followed & actually
seen if they were stimulated by another set of
Basically, MRI is a body scanner that is sensitive
to different tissues .Thus, it is able to differentiate
the magnetic signal from the atomic nucleus of
healthy tissue from that of a cancer tissue.
Magnetic conveyor belt
In playing toys.
In televisions, computers , etc.
In electric guitars.
• MRAM : - Magnetic Random Access
adva nta ge s :-
Reduced power consumption.
Suffers no degradation over time in
comparison to flash memory.
Earth is like a giant magnet !
• The nickel iron core of the earth gives the
earth a magnetic field much like a bar
• The magnetic field of earth doesn’t help us
just navigate , it actually saves the planet
from being destroyed by magnetic storms
emanating from space.
The world of magnets is really fascinating.
Magnets have been virtually in every
aspect of our lives & the future of the
modern generation solely depends upon the
future development of magnets & their