Physics project on the topic
1- To trace the line of forces due to a bar magnet in the Earth’s magnetic
field (north over north) and find the neutral point.
2- To trace the line of forces due to a bar magnet in the Earth’s magnetic
field (south over south) and to find its neutral point.
For the fulfillment of the terms and conditions set
by the C.B.S.E. for the physics practical paper
of the all India senior secondary school examination 2023-24
Submitted by :Class :Roll no. :D.A.V. Public school
MCL Brajrajnagar
Project Supervisor :MR. Suresh Nepak
PGT , PHYSICS
D.A.V. Public school
MCL Brajrajnagar
ACKNOWLEDGEMENT
I would like to express my gratitude to the people who have helped me and
supported me throughout this project . I am grateful to my project supervisor
Mr.S.Nepak and Mr. RK Shukla for their encouragement , continuous support for
this project and constructive advice given at various stages of the development of
this project . I wish to thank my parents for their undivided support and interest
who inspired me and encouraged to go on my own way without whom I would be
unable to complete my project . At last but not the least I want to thank my friends
who appreciated me for my work and motivated me .
Name:Class:Roll No.:-
CERTIFICATE
This is to certify that ____________________ of CLASS XII Sc. has satisfactorily
completed his/her project on “DEMONSTRATION ON MAGNETIC FIELD LINES
PRODUCED BY BAR MAGNET” as a part of his/her higher secondary courses in
session 2023-24 . The work has been carried out in our school laboratory under my
guidance and supervision .
I report the submission of the project report prepared by ________________
Date –
Teacher’s signature
EXPERIMENT - 1
AIM OF THE EXPERIMENT :
To trace the line of force due to a bar magnet in the earth’s magnetic field pointing north
and to find its neutral point.
APPARATUS REQUIRED :
. A bar magnet
.Compass needle
.A sheet of white paper
.A drawing board with pins
THEORY:
A line of force is a curve in a magnetic field such that the tangent drawn at any point on the
curve gives the direction of the resultant magnetic field at the point . If the bar magnet
kept in a magnetic meridian with its north pole pointing towards the geographic north of
the earth , the field due to the magnet and the earth are in the same direction at the point
on the axial line and opposite at point on the equatorial line . So the resultant field is
stronger at the axial line and weaker at the equatorial point .
THE NEUTRAL POINT IS ON THE EQUITORIAL LINE :
The magnetic field at the neutral point is given by
B(equatorial)=BH=(μ0/4π).(2m/r3)
r=distance of neutral point from centre of magnet
m=dipole moment of magnet
the neutral point is a point where the resultant field due to magnet is zero.
At this point , magnetic field due to magnet is equal to and opposite to the
horizontal component of the earth’s magnetic field.
PROCEDURE:
# A proper sheet was perfectly placed over the drawing board and fixed with the help of pins.
#The magnetic needle as placed at the centre of the paper sheet and magnetic meridian was found
out.
#The given bar was placed on the magnetic meridian with its north pole pointing towards the
geographic north of the earth .
#The magnetic needle was placed near one end of the magnet . When the deflection of the needle
stopped , two dot marks were given on the paper corresponding to the position of both the end of
the needle .
#The magnetic field was placed at subsequent position so that one end of it coincides with other
point already plotted . The other end of the needle was then plotted by the dot mark . This was
continued till a series of dots were drawn on this way several lines of force were drawn due to bar
magnet in the earth’s magnetic field symmetrically on both sides of paper.
#The neutral points were located by observing the points where no magnetic
influence was felt by needle . The point where it freely round is neutral point .
Neutral point was found out on the axial line.
PRECAUTIONS:
.No two lines of forces cross each other.
.Neutral point should be in symmetrical with respect to magnetic field.
.Lines of forces starts from the north pole and end on south pole of the
bar magnet.
EXPERIMENT – 2
AIM OF THE EXPERIMENT:
To trace the lines of force due to a bar magnet in the earth’s magnetic field pointing south
and to find its neutral point .
APPARATUS REQUIRED:
.A bar magnet
.Compass needle
.A sheet of white paper
.A drawing board with pins
THEORY:
A line of force is a curve in a magnetic field such that the tangent drawn at any point on the
curve gives the direction of the resultant magnetic field at the point . If the bar magnet
kept in a magnetic meridian with its south pole pointing towards the geographic north of
the earth , the field due to the magnet and the earth are in the same direction at the point
on the axial line and opposite at point on the equatorial line . So the resultant field is
stronger at the equatorial point and weaker at the axial line .
THE NEUTRAL POINT IS ON THE EQUITORIAL LINE :
The magnetic field at the neutral point is given by
B(equatorial)=BH=(μ0/4π).(2m/r3)
r=distance of neutral point from centre of magnet
m=dipole moment of magnet
the neutral point is a point where the resultant field due to magnet is zero. At
this point , magnetic field due to magnet is equal to and opposite to the
horizontal component of the earth’s magnetic field
PROCEDURE:
# A proper sheet was perfectly placed over the drawing board and fixed with the help of pins.
#The magnetic needle as placed at the centre of the paper sheet and magnetic meridian was found out.
#The given bar was placed on the magnetic meridian with its south pole pointing towards the geographic north
of the earth .
#The magnetic needle was placed near one end of the magnet . When the deflection of the needle stopped ,
two dot marks were given on the paper corresponding to the position of both the end of the needle .
#The magnetic field was placed at subsequent position so that one end of it coincides with other point already
plotted . The other end of the needle was then plotted by the dot mark . This was continued till a series of dots
were drawn on this way several lines of force were drawn due to bar magnet in the earth’s magnetic field
symmetrically on both sides of paper.
#The neutral points were located by observing the points where no
magnetic influence was felt by needle . The point where it freely round
is neutral point . Neutral point was found out on the equatorial line.
PRECAUTIONS:
.No two lines of forces cross each other.
.Neutral point should be in symmetrical with respect to magnetic field.
.Lines of forces starts from the north pole and end on south pole of the
bar magnet.