The document discusses electromagnetic fields (EMF). It begins by defining EMF as a physical field produced by moving electrically charged objects that affects behavior of nearby charged objects. It notes EMF extends indefinitely through space and is one of four fundamental forces. The field combines electric fields from stationary charges and magnetic fields from moving charges. The document then provides examples of uses for electromagnets and discusses electromagnetic induction, transformers, exposure to EMF, and contrasts EMF with gravitational fields.
Presentation on Electromagnetic Induction.
Physics two presentation of CSE dept. Southeast University.
PPTX slides made by Saleh Ibne Omar.
December 2017.
1. Introduction
2. History of transformer
3. Principle
4. Construction and Working
5. Types of Transformer
6. Application
7. Auto transformer
8. Need of transformer
Presentation on Electromagnetic Induction.
Physics two presentation of CSE dept. Southeast University.
PPTX slides made by Saleh Ibne Omar.
December 2017.
1. Introduction
2. History of transformer
3. Principle
4. Construction and Working
5. Types of Transformer
6. Application
7. Auto transformer
8. Need of transformer
Electromagnetic induction builds on the concept of magnets and magnetic fields in grade 10. Most of the work covered here is quite clear and straight forward.
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... An electromagnet works because an electric current produces a magnetic field. Electromagnetism is produced when an electrical current flows through a simple conductor such as a length of wire or cable, and as current passes along the whole of the conductor then a magnetic field is created along the whole of the conductor.
Electromagnetic induction builds on the concept of magnets and magnetic fields in grade 10. Most of the work covered here is quite clear and straight forward.
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... An electromagnet works because an electric current produces a magnetic field. Electromagnetism is produced when an electrical current flows through a simple conductor such as a length of wire or cable, and as current passes along the whole of the conductor then a magnetic field is created along the whole of the conductor.
ELECTROMAGNETISM
INTRODUCTION
The phenomenon where by electricity creates magnetism is known as electromagnetism. When an insulated wire is wrapped with round an iron nail and the ends of the wire connected to the battery the nail becomes capable of picking up iron fillings paper. This is a simple electromagnet. The nail has been magnetized by the current in the wire. Disconnecting the wire from the battery the paper clips fall off. The nail looses most of first magnetism when the current is switched off. The passage of electric current along a wire creates a magnetic field around the wire. The lines of forces due to a straight current carrying wire are circles, center on the wire on the wire. The field is strongest near the wire the direction of the magnetic field is r
oday, the Lok Sabha, apart from introducing the Electricity (Amendment) Bill, 2022 and will take up two more Bills — the Energy Conservation (Amendment) Bill, 2022 and the New Delhi International Arbitration Centre (Amendment) Bill, 2022 — for discussion, considering and passing. The Rajya Sabha is scheduled to discuss the Central Universities (Amendment) Bill, 2022 for considering and passing.
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description about electromagnetic field strength exposure to how it's effect at human body and what is the standard value assign in the world according to generations, it's also related to manufacturer equipment, as well depend on area population , the exposure of electromagnetic propagation is probational to antenna height and input power of the antenna
Electric charges
Current
Potentialand its difference
Circuits
Heating effects
Magnetic effects
Magnetic Field Lines in straight and coiled conductors
Electromagnets
Electromagnetic Induction
Motors and Generators
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The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
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How to Make a Field invisible in Odoo 17Celine George
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Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
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New development in herbals,
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
2. PRESENTED BY:
• Group No.: 04
• Group Member:
Amarta Sarkar (001)
Asadul Islam (005)
Nasim Ali (006)
Shawan Roy (023)
Sabrina Wazir (039)
Department of Textile, BUBT
• 5th Intake , Section : 1
3. ELECTROMAGNETIC FIELD
• An electromagnetic field (also EMF or EM field) is a physical field
produced by moving electrically charged objects.
• It affects the behavior of charged objects in the vicinity of the field.
• The electromagnetic field extends indefinitely throughout space and
describes the electromagnetic interaction.
• It is one of the four fundamental forces of nature (the others are
gravitation, the weak interaction, and the strong interaction).
• The field can be viewed as the combination of an electric field and a
magnetic field.
• The electric field is produced by stationary charges, and the magnetic
field by moving charges (currents); these two are often described as the
sources of the field.
4. ELECTROMAGNETISM
• Electromagnetism is one of the fundamental phenomenon in nature. It
is responsible for almost all the phenomena in our daily life.
• Electromagnetism spans both electric fields and magnetic fields.
• When observed individually, electricity and magnetism behave
differently but when unified, we can observe that both are
interdependent on each other and they cannot be separated from each
other.
• In order to fully understand Electromagnetism, we have to look at the
four laws that govern electricity and magnetism.
• These are Gauss’s laws in Electrostatics, Gauss’s law in
Magnetism, Ampere’s law and Faraday’s law.
• These laws were combined by James Clerk Maxwell in the year 1864 to
give a complete set of relation and connection between both the forces
of electricity and magnetism.
5. ELECTIC FILEDS AND MAGNETIC FIELDS
MAGNETIC
ELECTRIC FIELDS FIELDS
1. Electric fields arise from 1. Magnetic fields arise from
voltage. current flows.
2. Their strength is measured 2. Their strength is measured in
amperes per meter (A/m).
in Volts per meter (V/m) Commonly, EMF investigators
3. An electric field can be use a related measure, flux
density (in micro tesla (µT) or
present even when a device mille tesla (mT) instead.
is switched off.
3. Magnetic fields exist as soon as
4. Field strength decreases a device is switched on and
with distance from the current flows.
source. 4. Field strength decreases with
5. Most building materials distance from the source.
shield electric fields to 5. Magnetic fields are not
some extent. attenuated by most materials.
6. USES FOR ELECTROMAGNETS
• An electromagnet does all the things that ordinary magnets can
do, but you can switch them on and off.
• An electric bell – uses an electromagnet to rapidly pull the
hammer over to the gong then release it.
• For sorting scrap – an electromagnet can be used to pick up
and put down magnetic materials, sorting them from non-
magnetic scrap.
• In speakers – an electromagnet is used to move a cone very
rapidly, causing sound waves.
• In switches – a small current can be used to operate an
electromagnet, which in turn can control another circuit in
which a much larger current might be flowing. This isolates the
large current from the person operating the switch, making it
safer.
10. THE MOTOR EFFECT
“A conductor carrying an electric
current may experience a force when
placed into a magnetic field.”
To increase this force:
Increase the current
Increase the number of coils
Increase the strength of the magnet
Increase the length of conductor in
the field
To reverse this force:
Reverse the direction of the current
Reverse the direction of the
(permanent) magnetic field
NOTE: There is NO FORCE if the
conductor is parallel to the field.
11.
12. Reverse the Keep the field
field the same
Keep the current Reverse the
the same current
Motion
Current
Field Motion Motion
reverses reverses
14. ELECTROMAGNETIC INDUCTION
A potential difference is induced across the ends of a conductor when it
cuts across magnetic field lines. This is called Electromagnetic
Induction.
The same effect occurs if the conductor is held still and the magnetic
field changes.
The faster the conductor cuts the field lines (or the faster the magnetic
field changes) the bigger the potential difference induced.
15. A SIMPLE DYNAMO
If the conductor forms part of
a circuit, a current will flow.
In a dynamo, a coil is rotated
inside a magnetic
field, causing an alternating
current to flow.
You can use the right hand
rule to prove to yourself that a
current will flow all the way
around the coil of wire when
the coil is rotated.
18. TRANSFORMERS
• A coil of wire is wound on to
one side of a soft iron core.
This coil is called the primary
coil.
• When an alternating current
flows through this wire, an
alternating electromagnetic
field is set up in the core.
19. TRANSFORMERS
• If a secondary coil is then wound
on to the other side of the
core, this changing magnetic field
will induce an alternating potential
difference across the ends of the
secondary coil.
20. TRANSFORMERS
Transformers step voltage up or down. The
size of the induced voltage is given by the
ratio:
p.d. acrossprimary number of turns on primary
p.d. acrosssecondary number of turns on secondary
or
Vp Np
Vs Ns
21. TRANSFORMERS AND MAINS SUPPLY
• Electricity is generated at the power station at about
33,000V.
• A step-up transformer steps this up to about 400,000V for
transmission in overhead cables.
• This is then stepped down for use in homes, to 230V (or
for industrial uses, to 11,000V).
• WHY?
22. TRANSFORMERS AND MAINS SUPPLY
• When the potential difference is stepped up, the current is
stepped down.
• So there is a lower current flowing through the wires.
• This means that less energy is lost to heat (P=I2R).
• So more of the power supply’s energy gets to the
appliance, rather than being lost in the wires.
23. WHAT HAPPENS WHEN YOU ARE EXPOSED TO ELECTROMAGNETIC FIELDS?
Exposure to electromagnetic fields is not a new phenomenon.
However, during the 20th century, environmental exposure to man-made
electromagnetic fields has been steadily increasing as growing
electricity demand, ever-advancing technologies and changes in social
behavior have created more and more artificial sources.
Everyone is exposed to a complex mix of weak electric and magnetic
fields, both at home and at work, from the generation and transmission
of electricity, domestic appliances and industrial equipment, to
telecommunications and broadcasting.
Tiny electrical currents exist in the human body due to the chemical
reactions that occur as part of the normal bodily functions, even in the
absence of external electric fields.
24. ELECTROMAGNETIC FIELDS AT HOME
Electricity is transmitted over long distances via high voltage power
lines.
Transformers reduce these high voltages for local distribution to homes
and businesses.
Electricity transmission and distribution facilities and residential wiring
and appliances account for the background level of power frequency
electric and magnetic fields in the home.
In homes not located near power lines this background field may be up
to about 0.2 µT.
Directly beneath power lines the fields are much stronger.
House walls substantially reduce the electric field levels from those
found at similar locations outside the house.
27. SUMMARY OF THE ICNIRP EXPOSURE GUIDELINES
European Mobile phone Microwave
power base station oven
frequency frequency frequency
50 Hz -50 Hz 900 MHz -1.8 2.45 GHz
Frequency
GHz
Electric field Power density Power density
(V/m) -Magnetic (W/m2) -Power (W/m2)
field (µT) density (W/m2)
28. ELECTROMAGNETIC AND GRAVITATIONAL FIELDS
o Sources of electromagnetic fields consist of two types of
charge –> positive and negative.
o This contrasts with the sources of the gravitational
field, which are masses.
o Masses are sometimes described as gravitational
charges, the important feature of them being that there is
only one type (no negative masses), or, in more colloquial
terms, 'gravity is always attractive'.
30. REFERENCES
Wikipedia
WHO
Google Search
Some Books:
1. Electromagnetic Fields (2nd Edition), Roald K.
Wangsness, Wiley, 1986. ISBN 0-471-81186-6 (intermediate level
textbook)
2. Schaum's outline of theory and problems of
electromagnetics(2nd Edition), Joseph A. Edminister, McGraw-
Hill, 1995. ISBN 0070212341(Examples and Problem Practice)