This document provides an introduction to magnetism, including the following key points: - Magnets are substances that attract iron particles and can be natural or artificial. Natural magnets are found in nature, while artificial magnets are man-made by magnetizing iron. - The magnetic field is the region around a magnet where its influence can be felt, denoted by B and measured in Tesla. Magnetic field lines start at the North pole and end at the South pole. - Magnetic flux is the number of magnetic field lines passing through a given area, denoted by Φ and measured in Weber. Magnetic flux density is the number of field lines crossing a unit area kept normal to the field lines, measured in

1. UNIT-5
MAGNETISM AND
ELECTROMAGNETISM
TEACHING COMPETENCY
LEVEL 2
R.SANGEETHA
1122119BD138

2. LESSON PLAN
Topic : Introduction to Magnetism
Content : Magnets - Discovery of
magnet - Kinds of magnet -
Magnetic field - Magnetic field
lines - Magnetic flux - Magnetic
flux density - Properties of
magnetic lines of force.

3. •
•
•
•
•
Let's imagine where I bring an iron
nail near a 🧲magnet.
What will happen?
Yes, the iron nail will stick to the
magnet.
Do you know why?
Because magnet is a substance or
material that attracts iron particles.

10. MAGNETS

11. KINDS OF MAGNET
•
•
•
•
Natural magnet: found in Earth naturally.
Eg: lodestone magnetite
Artificial magnets: man made by magnetizing
iron.
Eg: magnets available in shops.

12. MAGNETIC FIELD
•
•
•
•
Magnetic field is the region around the
magnet where it's magnetic influence
can be felt.
It is denoted by B.
It's unit is Tesla.
The direction of magnetic field around a
magnet can be found by placing a small
compass in the magnetic field.

13. MAGNETIC FIELD LINES
•
•
A magnetic field like is defined as the curve
drawn in the magnetic field in such a way that
the tangent to the curve at any point gives the
direction of the magnetic field.
They start at the North Pole and end at the
South Pole.

14. MAGNETIC FLUX
•
•
•
•
Magnetic flux is the number of magnetic field
lines passing through a given area.
It is debited by pihttps://goo.gl/search/
Symbol+of+magnetic+flux
It is usually denoted by Φ.
The SI unit of magnetic flux is the weber .

15. MAGNETIC FLUX DENSITY
•
•
The number of magnetic field lines
crossing unit area kept normal to the
direction of field lines is called
magnetic flux density.
It's unit is Wb/m2.

16. PROPERTIES OF MAGNETIC LINES
OF FORCE
•
•
•
•
•
Magnetic lines of force are closed, continuous
curves, extending through the body of the
magnet.
Magnetic lines of force start from the North Pole
and end at the South Pole.
Magnetic lines of force never intersect.
They will be maximum at the poles than at the
equator.
The tangent draw at any point on the curved line
gives the direction of magnetic field.