<< Chapter < Page Chapter >> Page >

A ferromagnetic material is a substance that shows spontaneous magnetisation.

Permanent magnets

The poles of permanent magnets

Because the domains in a permanent magnet all line up in a particular direction, the magnet has a pair of opposite poles, called north (usually shortened to N ) and south (usually shortened to S ). Even if the magnet is cut into tiny pieces, each piece will still have both a N and a S pole. These magnetic poles always occur in pairs. In nature, we never find a north magnetic pole or south magnetic pole on its own.

Magnetic fields are different from gravitational and electric fields. In nature, positive and negative electric charges can be foundon their own, but you never find just a north magnetic pole or south magnetic pole on its own. On the very small scale, zooming in to the size of atoms, magnetic fields are caused bymoving charges (i.e. the negatively charged electrons).

Magnetic attraction and repulsion

Like (identical) poles of magnets repel one another whilst unlike (opposite) poles attract. This means that two N poles or two S poles will push away from each other while a N pole and a S pole will be drawn towards each other.

Attraction and Repulsion

Like poles of magnets repel each other whilst unlike poles attract each other.

Do you think the following magnets will repel or be attracted to each other?

  1. We are required to determine whether the two magnets will repel each other or be attracted toeach other.

  2. We are given two magnets with the N pole of one approaching the N pole of theother.

  3. Since both poles are the same, the magnets will repel each other.

Do you think the following magnets will repel or be attracted to each other?

  1. We are required to determine whether the two magnets will repel each other or be attracted toeach other.

  2. We are given two magnets with the N pole of one approaching the S pole of theother.

  3. Since both poles are the different, the magnets will be attracted to each other.

Representing magnetic fields

Magnetic fields can be represented using magnetic field lines starting at the North pole and ending at the South pole. Although the magnetic field of a permanent magnet is everywhere surrounding the magnet (in all three dimensions), we draw only some of the field lines to represent the field(usually only a two-dimensional cross-section is shown in drawings).

In areas where the magnetic field is strong, the field lines are closer together. Where the field is weaker, the field lines are drawn further apart. The number of field lines drawn crossing a given two-dimensional surface is referred to as the magnetic flux . The magnetic flux is used as a measure of the strength of the magnetic field over that surface.

  1. Field lines never cross.
  2. Arrows drawn on the field lines indicate the direction of the field.
  3. A magnetic field points from the north to the south pole of a magnet.

Investigation : field around a bar magnet

Take a bar magnet and place it on a flat surface. Place a sheet of white paper over the barmagnet and sprinkle some iron filings onto the paper. Give the paper a shake to evenly distribute the iron filings. In yourworkbook, draw the bar magnet and the pattern formed by the iron filings. Draw the pattern formed when you rotate the bar magnet to a different angle asshown below.

Questions & Answers

What would you say about the the mobility of enterprise as a factor of production?
Cathryn Reply
how can I connect myself to this Ambrose platform
kanu Reply
I am good and you I am from sierra Leone and I am new her
kanu Reply
u are welcome bro, here is a good platform for you to be
Alie
That i know,thanks bro.
what the main definition of economic
Uhara Reply
Essay about Microsoft
Kwena Reply
what is economics
Julie Reply
what do you mean by means in economics
Julie
economic is the wealth of a country.
Moussa
monetary policy is refer to as being expansionary or contractionary.
Abdul
pls who can help me to explain money market and capital market
Au
money market is base on short term loan which is within one year period while capital market is long term loan more than one year...
Muhammad
money market is a market were short term loans are dealt with while capital market is a market were long term loans are traded
Ebrima
What is mean by monetory policy
Lovely
monetary polices are rules that control the rate of monetary exchange in an economic as a whole.
Ebrima
wealth of the nation
Uhara
important of unemployment
Otwe Reply
Important of unemployed
Otwe
important?
Aneela
what is meaning scarcity
ABDULLAHI Reply
Scarcity can be define as human wants to goods,services,resources for exceed of what is available
Uhara
hi guys
Ibrahim
How are you
Abdul
Can be defined as the inability to get everything we want
Zuko
less ability for the available goods and services that's on sale
kanu
what is consumer
Brenda Reply
how do consumer help people
Brenda
by export trading
Jayah
How do you mean Jayah
Danjuma
what is different between price and quantity
Yakubu
what is MRS
Rashid
definition of economics according to Adam Smith
Ijeoma Reply
economic is a wealth of nation
Au
in the view of Adam Smith economics is the study of activities of people in production of wealth
suresh
Economics is any human activity that lead to the provision of substance and or amassing wealth.
What do you really think is the remedy for scarcity in Nigeria 🇳🇬
John Reply
different the term economics
zfekere Reply
importance of studying economics
Haruna Reply
importance of economics
Haruna
different the term economics
zfekere
mixed economic
tadesse
you have just been appointed in the director of finance for your state internal revenue board with the knowledge of elasticity advice the state government on how the I.G.R of the state could be raised through exercise duties bearing in mind the implication and incident of taxing setting products
Kenechukwu Reply
Hello,Thanks for your replay
Esmael
fine
IDRIS
mention 5 characteristics of traditional societies
Pono Reply
dominance of agriculture and ignorance of development avenues are some characteristics of traditional societies.
sade
A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
Difference between extinct and extici spicies
Amanpreet Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Physics - grade 10 [caps 2011]. OpenStax CNX. Jun 14, 2011 Download for free at http://cnx.org/content/col11298/1.3
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Physics - grade 10 [caps 2011]' conversation and receive update notifications?

Ask