Sample of EMF for communication equipment vs home appliance
Full description
Field report on aravali biodiversity parkFull description
hc verma Hindi
matric subjectFull description
It is a technolgy by which we can produce cooling Effect Using MAgnets and Magnetic MAterials......Full description
It is a technolgy by which we can produce cooling Effect Using MAgnets and Magnetic MAterials......
How to write a field report
fulll report of malekhu
It is a sample geology feild report prepared by IOE, Pulchowk 070 batch in forth semester.
field practical report ,it is very useful for those who wishes to prepare report in the field of procurement at government sectors
Full description
Field Report of Draconis Combine
Topic:
Magnetic Fields Purpose:
To study the behavior of a bar magnet in varying magnetic fields at the end of a solenoid and hence estimates the horizontal component
BH
of the Earth¶s magnetic
fields. Introduction: A
magnet is a material or object that produces a magnetic field. Magnetic field
usually denoted as
is a region where a magnetic force exists. If any other magnet or
magnetic material coming into this region will experience a force. Magnetic field sources are essentially dipolar in nature, having a north and south magnetic pole. It can be create with moving charges, such as a current-carrying wire.
A
magnetic field can also
be created by the spin magnetic dipole moment, and by the orbital magnetic dipole moment of an electron within an atom. The magnetic field
at a point is a vector quantity having both magnitude
(strength) and direction(orientation of a compass needle) in which the N-pole of a magnet points which is proportional to how strongly the compass needle orients along that direction. The SI unit for magnetic field is the Tesla, which can be seen from the magnetic part of the Lorentz force law F magnetic = qvB to be composed of (Newton x second)/(Coulomb x meter).
A
smaller magnetic field unit is the Gauss (1 Tesla =
10,000 Gauss). If a magnet is suspended form a thread, it always ends up pointing in the same direction. One end points nearly to the North, the other to the South. The pole at the end pointing North is called the north seeking pole or N pole. The pole at the end pointing South is called the south seeking pole or S pole. The Earth is similar to a bar magnet which it also possesses a magnetic field. The Earth's magnetic field, also called the geomagnetic field, which effectively extends several tens of thousands of kilometres into space, forms the Earth's magnetosphere. 1
The strength of Earth magnetic field ranges from 30 microteslas in an area including most of South
America
and South
Africa
to over 60 microteslas around the
magnetic poles in northern Canada and south of Australia, and in part of Siberia. The magnetic field strength of the Earth varies with time and also location at which the strength is measured.
A
magnetized needle will come to rest in a definite
direction and the definite angle to the horizontal while it is freely suspended by a torsionless thread through its centre of gravity. In figure above, the pattern of the Earth¶s field lines is shown and B H can be measured with a deflection magnetometer or with a ballistic galvanometer. B H value also can be determined by using formula. Apparatus:
1.
A
retort stand with two clamps.
2. A
cork and an optical pin.
3.
A
set of small bar magnet fixed with a pair of optical pins
4.
A
plane mirror attached to a protractor
5. Thread of length about 40cm 6.
A
test-tube wound with copper wires
7.
A 2V
8.
A
9.
An
accumulator
(0-1) A dc ammeter on-off switch and three connecting wires
10. A rheostat 11. A pair of vernier calipers 12. A micrometer screw gauge Procedure:
1. The cork with a pin was clamped to the retort stand and the bar magnet was hung from the pin by using the thread supplied about 5cm above the table. 2. All
magnetic materials were kept away including the ammeter and the magnet
was allowed to stay stationary.
2
3. The mirror with the protractor was placed below the magnet and the 0 - 180 r
r
axis parallel to the pins on the magnet. 4. The solenoid was hold in a horizontal position at the same level with the magnet by using the other clamp. 5. The orientation of the solenoid was adjusted so that its axis is perpendicular to the axis of the magnet and one end of the solenoid was at 3.0cm from the axis of the magnet. 6.
A
rheostat, ammeter, power supply and switch were connected to the solenoid in
series as shown in diagram below. The ammeter was kept about 50cm from the magnet. 7. The rheostat was adjusted to maximum resistance and the switch was closed. 8. The reading
of the ammeter was recorded and the average deflection of the
magnet from 0 - 180 axis was obtained. r
r
9. The value of the resistance of the rheostat was decrease in stages so as to
ll measurement for , and tan graph of tan against was plotted. t the point where = 0. 0 , the gradient
change the value of and then the corresponding value of 10. A
was measured.
.
11. A 12. A
2 A
s
of the graph of tan
against was
found. 13. The solenoid was removed. 14. The internal diameter D of the solenoid, average diameter d of the wire used in the solenoid and length L of the solenoid were measured and recorded. 15. The number of turns
The horizontal component of Earth¶s magnetic field is 3. 34 x 10 -5 T. Based on
against that have been plotted, it shows a straight line. This shows that the tan is proportional to the current, . The greater the current, the greater the value of tan is. The gradient of the graph is 0.3 . the graph of tan
2
Conclusion:
The value is in the range of the real value of earth magnetic field. It is show that this experiment can be used to measure the horizontal component magnetic fields. 4
