The document is a presentation about magnetic fields and field lines. It defines magnetic field as the space around a magnet where magnetic force can be felt. It describes how to locate magnetic fields using iron filings or a compass, and defines magnetic field lines as the paths that an independent north pole would take in a magnetic field. It discusses the properties of strong and weak magnetic fields based on the closeness of field lines, and types of magnetic fields such as uniform and non-uniform. Key properties of magnetic field lines are that they are continuous closed curves, give the direction of the magnetic field, and do not intersect.

1. PPT presentation
On
Magnetic field, field lines
And using hand board.
Submitted by Submitted to
Samar kansal Mr. Tajinder
Roll no.38 (subject teacher)

2. contents
Magnetic field
Magnetic lines of force
Strong and weak magnetic
field
Types of magnetic field
Properties of magnetic field

4. Magnetic field
The force with which a magnetic poles of a
magnet attracts or repels another magnetic pole
of another magnet is called as Magnetic force .
The space or region around a magnet within
which magnetic force is exerted on other magnet
is called magnetic field of the magnet .
Definition of magnetic field : The space or region
around a magnet (or a current carrying wire)
within which its influence can be felt (or magnetic
force is experienced) by another magnet is called
magnetic field . It is denoted by B

5. To locate the magnetic field of a bar
magnet, we use iron filings or a magnetic
compass. When a magnetic compass is
far away from a magnet , it is not
deflected . However ,when a magnetic
compass is closer to the magnet , it is
deflected . So the space or region
around a magnet within which a
magnetic compass is deflected is known
as magnetic field of the bar magnet in
the field

6. Magnetic lines of force
(or magnetic field lines)
A magnetic field is represented by a series of
lines (or paths) around a magnet . These
lines represent the paths of an imaginary
independent pole if it were allowed to move
freely in the direction of magnetic force.
Definition of magnetic field line : The path
(straight or curve) along which unit north pole
moves in a magnetic field (if free to do so) is
called magnetic field.

8. Magnetic lines of force or magnetic field
lines are helpful to show the direction
and strength (or intensity ) of a
magnetic field.
The direction of the magnetic
field at any particular space is the
direction in which the north pole of a
magnetic compass needle points if
placed at that point .The strength of a
magnetic field is shown by how much
close these lines are to each other in
their respective manner

9. Strong and weak
magnetic field
Strong magnetic field
If magnetic fields are very close to each other (i.e.
crowded) in a particular region , then the strength of
magnetic field in that field is very large or the
magnetic field is strong .
Weak magnetic field
If the magnetic field lines are far away from each
other in a particular region ,then the strength of the
magnetic field in that region is very small or magnetic
field is weak .

10. Types of magnetic field
Uniform magnetic field
Magnetic field is said to be uniform if its
magnitude is equal and direction is same at every
point in the space or that particular region.
Non uniform magnetic field
Magnetic field is said to be non uniform magnetic
field if its magnitude is not equal and direction is
not same at every point in the space.

11. Properties of magnet field lines
1.Magnetic field are closed continuous
curves. Magnetic field lines emerge from a magnet
at N-pole and enter the magnet at S-pole .
2.The tangent at any point on the magnetic field lines
give the direction of the magnetic field at that point.
3.No two magnetic field lines can intersect
each other.
4.Magnetic field lines are crowded (i.e. close
to each other ) in a region of weak magnetic
field.

12. Thank you