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Chapter 5 – Magnetism

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:

Introduction

When you look around yourself, do you see the colourful surroundings that bring you joy? You must have seen many light-emitting devices at your home, like LED bulbs, tube lights and more. So what is light, and how are you able to see things in the light? These questions would be answered in this coming article which talks about light, its properties and some important exam questions based on this chapter.Do you know that the earth is a huge magnet with poles on either side of its diameter? You must have heard that magnets attract iron objects and can also repel other magnets. So how is this possible that a physical substance is capable of attracting and holding other objects with it? What is the history of magnetism? We will answer all these questions in the coming blog.

Magnetism is the phenomenon that is produced by the magnets and mediated by magnetic field lines associated with the magnets. Magnets are physical substances having magnetic properties of attraction and repulsion. There are different types of magnets, including horseshoe magnet, bar magnet, ring magnet, cylindrical magnet and more. 

All these magnets have two poles, namely the North Pole and the South Pole, which attracts and repels objects.

History of Magnet Discovery: There is no solid proof of the discovery, as it is said that a shepherd named Magnes discovered a stone called Magnetite because his iron stick got stuck to that stone

There are two types of substances based on their magnetism.

  • Magnetic Substances: Substances that are attracted to magnets are called magnetic substances. For example, iron, nickel, cobalt, zinc and more.
  • Non-Magnetic Substances: Substances that do not get attracted to magnets are called non-magnetic substances. For example, wood, fibre, glass, rubber and more.

A magnet has some unique properties:

  • Attractive Property: Magnet attracts other ferromagnetic materials such as cobalt, nickel. Also, the unlike poles of magnets attract each other.
  • Repulsive Property: Like poles of magnets repel each other.
  • Directive Property: Freely suspended magnets align themselves in a particular direction that is north-south.

Every magnet forms a magnetic field around them. This can be easily demonstrated by a simple activity as given below.

Place a bar magnet in between a heap of iron filings. The iron filings will arrange into a certain circular direction accumulating at the poles. Hence it is proof that the magnets create a magnetic field around them due to magnetic field lines. The iron filings arrange themselves in the magnetic field lines.

Earth is a huge magnet, and magnetic lines run inside the diameter of the earth. The earth’s north-pole functions as the geometric south-pole and attracts the north pole of a bar magnet and vice-versa. The below activity can demonstrate this.

Take a bar magnet and freely suspend it in the air using a thread tied at the bar magnet’s middle. The bar magnet will suspend itself in the north-south direction, and hence it is proved that the earth behaves as a huge magnet. This property also helps in the manufacturing of a compass that helps in finding direction.

There are two types of magnets.

  • Permanent magnets: These are permanent magnets and hold their magnetic property forever. These permanent magnets are widely used in healthcare equipment like the MRI scan, which uses a large and powerful magnet to diagnose the body.
  • Temporary magnets: These magnets hold their magnetic property only for a short period of time and get demagnetised afterwards. You can make temporary magnets at your home with a simple iron tool.

You can make your own temporary magnet at home using a simple iron piece and a magnet. Check the below activity to make your magnet.

  • Take a rectangular iron bar and put it on the table.
  • Now, using a magnet, rub the iron surface with the magnet by moving the magnet horizontally on its surface.
  • Repeat this process 35-40 times, and afterwards, your iron bar gets magnetised.

Check the following tips to take care of the magnets and use them for a long time.

  • Magnets can lose their magnetic properties if hammered or dropped from high heights. Hence refrain from doing these things.
  • Use an iron case to store magnets not to lose their magnetic properties.
  • Bar magnets should always be stored in pairs.

Magnets are naturally-occurring substances showing magnetism. They are widely used in our daily lives, from gadgets like TVs, stereos to large conveyor belts and more. Substances can be classified as magnetic and non-magnetic substances based on their reaction with magnets. We have many different magnets based on their shapes, stored carefully to keep their magnetic property for a long time.

  1. What are the magnets?
    Magnets are substances that have magnetic properties of attraction and repulsion and are used in daily objects.
  2. What are the different types of magnet based on their shape?
    The different types of magnets based on their shape are bar magnets, horseshoe magnets, oval-shaped magnets, needle-shaped magnets, ring magnets and cylindrical magnets.
  3. Can magnets be demagnetised?
    Yes, magnets can be demagnetised by hammering them, dropping them from large heights, putting them in water and more.
  4. What are magnetic field lines?
    Magnetic field lines are the lines that originate from the magnetic pole and create a magnetic field around the magnet.
  5. What are the applications of magnets?
    The different applications of magnets are in making compass, making seals, earphones, stereos, TVs and more. There are wide industry uses of magnets also that are used in the global manufacturing chain.

You can learn more about the different magnets and functions by checking the MSVgo learning app, which hosts many intuitive online video lessons.

High School Physics

  • Alternating Current
  • Atoms
  • Communication Systems
  • Current Electricity
  • Dual nature of Radiation and Matter
  • Electric Charges and Fields
  • Electricity
  • Electromagnetic Induction
  • Electromagnetic Waves
  • Electron Beams and Radioactivity
  • Electrons and Photons
  • Electrostatic Potential and Capacitance
  • Fluid Pressure
  • Force and Acceleration
  • Force And Laws Of Motion
  • Gravitation
  • Internal Energy
  • Kinetic Theory
  • Law of motion
  • Light – Reflection And Refraction
  • Magnetic Effects Of Electric Current
  • Magnetism and Matter
  • Management Of Natural Resources
  • Mechanical properties of Fluids
  • Mechanical properties of Solids
  • Motion
  • Motion in a plane
  • Motion in a straight line
  • Moving Charges and Magnetism
  • Nuclear Energy
  • Nuclei
  • Oscillations
  • Our Environment
  • Paths of Heat
  • Physical world
  • Ray optics and optical instruments
  • Semiconductor Devices
  • Semiconductor Electronics: Materials, Devices and Simple Circuits
  • Simple Machines
  • Sound
  • Sources Of Energy
  • Specific and Latent Heats
  • Spherical Mirrors
  • Static Electricity
  • Systems of Particles and Rotational motion
  • Thermal properties of matter
  • Thermodynamics
  • Units and Measurement
  • Vectors, Scalar Quantities and Elementary Calculus
  • Wave Optics
  • Waves
  • Work, Power and Energy

High School Chemistry

  • Acids, Bases and Salts
  • Alcohols, Phenols and Ethers
  • Aldehydes, Ketones and Carboxylic Acids
  • Aliphatic and Aromatic Hydrocarbons
  • Alkyl and Aryl Halides
  • Amines
  • Analytical Chemistry 
  • Atomic Structure
  • Atoms And Molecules
  • Basic concepts of Chemistry
  • Biomolecules
  • Carbon And Its Compounds
  • Carboxylic acids and Acid Derivatives
  • Chemical Bonding and Molecular Structures
  • Chemical Energetics
  • Chemical Equilibria
  • Chemical Kinetics
  • Chemical Reactions And Equations
  • Chemical Reactions and Their Mechanisms
  • Chemistry in Everyday Life
  • Chemistry of p-Block elements
  • Chemistry of Transition and Inner Transition
  • Classification of Elements
  • Coordination Compounds
  • Cyanide, Isocyanide, Nitro compounds and Amines
  • Electrochemistry
  • Electrolysis
  • Elements, Compounds and Mixtures
  • Environmental Chemistry
  • Equilibrium
  • Ethers and Carbonyl compounds
  • Haloalkanes and Haloarenes
  • Hydrocarbons
  • Hydrogen
  • Ideal solutions
  • Introduction to Organic Chemistry
  • Ionic equilibria
  • Matter
  • Matter Around Us
  • Matter In Our Surroundings
  • Metallurgy
  • Metals And Non-Metals
  • Mole Concept and Stoichiometry
  • Natural Resources
  • Organic Chemistry – Basic Principles
  • Periodic Classification of Elements
  • Physical and Chemical Changes
  • Physical and Chemical Properties of Water
  • Polymers
  • Preparation, Properties and Uses of Compounds
  • Principles and Processes of Isolation of Elements
  • Redox Reactions
  • Relative Molecular Mass and Mole
  • States of Matter
  • Structure Of The Atom
  • Study of Compounds
  • Study of Gas Laws
  • Study of Representative Elements
  • Surface Chemistry
  • The d-block and f-block elements
  • The Gaseous State
  • The p-Block Elements
  • The Periodic Table
  • The s-Block Elements
  • The Solid State
  • Thermodynamics

High School Biology

  • Absorption and Movement of Water in Plants
  • Adolescent Issues
  • Anatomy of Flowering Plants
  • Animal Kingdom
  • Bacteria and Fungi-Friends and Foe
  • Biodiversity and Conservation
  • Biofertilizers
  • Biological Classification
  • Biomedical Engineering
  • Biomolecules
  • Biotechnology and its Applications
  • Biotic Community
  • Body Fluids and Circulation
  • Breathing and Exchange of Gases
  • Cell – Unit of Life
  • Cell Cycle and Cell Division
  • Cell Division and Structure of Chromosomes
  • Cell Reproduction
  • Cellular Respiration
  • Chemical Coordination and Integration
  • Circulation
  • Control And Coordination
  • Crop Improvement
  • Digestion and Absorption
  • Diversity In Living Organisms
  • Ecosystem
  • Environmental Issues
  • Excretory Products and their Elimination
  • Flowering Plants
  • Genes and Chromosomes
  • Health and Diseases
  • Health and Its Significance
  • Heredity And Evolution
  • Heredity and Variation
  • How Do Organisms Reproduce?
  • Human Diseases
  • Human Eye And Colourful World
  • Human Health and Disease
  • Human Population
  • Human Reproduction
  • Hygiene
  • Improvement In Food Resources
  • Integumentary System- Skin
  • Kingdom Fungi
  • Kingdom Monera
  • Kingdom Protista
  • Life Processes
  • Locomotion and Movement
  • Microbes in Human Welfare
  • Mineral Nutrition
  • Molecular Basis of Inheritance
  • Morphology of Flowering Plants
  • Neural Control And Coordination
  • Nutrition in Human Beings
  • Organism and Population
  • Photosynthesis
  • Photosynthesis in Higher Plants
  • Plant Growth and Development
  • Plant Kingdom
  • Pollination and Fertilization
  • Pollution; Sources and its effects
  • Principles of Inheritance and Variation
  • Reproduction and Development in Angiosperms
  • Reproduction in Organisms
  • Reproductive Health
  • Respiration in Human Beings
  • Respiration in Plants
  • Respiratory System
  • Sexual Reproduction in Flowering Plants
  • Strategies for Enhancement in Food Production
  • Structural Organisation in Animals
  • Structural Organisation of the Cell
  • The Endocrine System
  • The Fundamental Unit Of Life
  • The Living World
  • The Nervous System and Sense Organs
  • Tissues
  • Transpiration
  • Transport in Plants

High School Math

  • Algebra – Arithmatic Progressions
  • Algebra – Complex Numbers and Quadratic Equations
  • Algebra – Linear Inequalities
  • Algebra – Pair of Linear Equations in Two Variables
  • Algebra – Polynomials
  • Algebra – Principle of Mathematical Induction
  • Algebra – Quadratic Equations
  • Binomial Theorem
  • Calculus – Applications of Derivatives
  • Calculus – Applications of the Integrals
  • Calculus – Continuity and Differentiability
  • Calculus – Differential Equations
  • Calculus – Integrals
  • Geometry – Area
  • Geometry – Circles
  • Geometry – Conic Sections
  • Geometry – Constructions
  • Geometry – Introduction to Euclid’s Geometry
  • Geometry – Three-dimensional Geometry
  • Geometry – Lines and Angles
  • Geometry – Quadrilaterals
  • Geometry – Straight Lines
  • Geometry – Triangles
  • Linear Programming
  • Matrices and Determinants
  • Mensuration – Areas
  • Mensuration – Surface Areas and Volumes
  • Number Systems
  • Number Systems – Real Numbers
  • Permutations and Combinations
  • Probability
  • Sequence and Series
  • Sets and Functions
  • Statistics 
  • Trignometry – Height and Distance
  • Trignometry – Identities
  • Trignometry – Introduction

Middle School Science

  • Acids, Bases And Salts
  • Air and Its Constituents
  • Basic Biology
  • Body Movements
  • Carbon and Its Compounds
  • Cell – Structure And Functions
  • Changes Around Us
  • Chemical Effects Of Electric Current
  • Chemistry in Your Life
  • Coal And Petroleum
  • Combustion And Flame
  • Components Of Food
  • Conservation Of Plants And Animals
  • Crop Production And Management
  • Electric Current And Its Effects
  • Electricity And Circuits
  • Elements and Compounds
  • Fibre To Fabric
  • Food production and management
  • Force And Pressure
  • Forests: Our Lifeline
  • Friction
  • Fun With Magnets
  • Garbage In, Garbage Out
  • Getting To Know Plants
  • Health and Hygiene
  • Heat
  • Hydrogen
  • Life Processes: Nutrition in Animals and Plants
  • Light, Shadows And Reflections
  • Materials: Metals And Non-Metals
  • Matter and Its States
  • Metals and Non-metals
  • Micro Organisms: Friend And Foe
  • Motion And Measurement Of Distances
  • Motion And Time
  • Nutrition In Animals
  • Nutrition In Plants
  • Organization in Living Things
  • Our Environment
  • Physical And Chemical Changes
  • Pollution and conservation
  • Pollution Of Air And Water
  • Reaching The Age Of Adolescence
  • Reproduction In Animals
  • Reproduction In Plants
  • Respiration In Organisms
  • Rocks and Minerals
  • Separation Of Substances
  • Simple Machines
  • Soil
  • Some Natural Phenomena
  • Sorting Materials Into Groups
  • Sound
  • Stars And The Solar System
  • Structure of Atom
  • Synthetic Fibers And Plastics
  • The Living Organisms And Their Surroundings
  • Transfer of Heat
  • Transformation of Substances
  • Transportation In Animals And Plants
  • Universe
  • Waste-water Story
  • Water: A Precious Resource
  • Weather, Climate And Adaptations Of Animals To Climate
  • Winds, Storms And Cyclones

Middle School Math

  • Addition
  • Area and Its Boundary
  • Boxes and Sketches
  • Data Handling
  • Fun With Numbers
  • Heavy and Light
  • How Many
  • Long And Short
  • Mapping
  • Measurement
  • Money
  • Multiplication and Factors
  • Multiply and Divide
  • Numbers
  • Parts and Wholes
  • Pattern Recognition
  • Patterns
  • Play With Patterns
  • Rupees And Paise
  • Shapes And Angles
  • Shapes And Designs
  • Shapes and Space
  • Similarity
  • Smart Charts
  • Squares
  • Subtraction
  • Tables And Shares
  • Tenths and Hundredths
  • Time
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