A magnetic field is the region around a magnet where it exerts a force on magnetic materials, like iron. It can attract or repel objects without direct contact. The magnetic field is visualised through magnetic lines of force, which show the direction and strength of the field. These lines go from the north pole to the south pole of the magnet. The closer the lines, the stronger the magnetic field at that point. Magnetic fields play an important role in nature and are key to the functioning of compasses, motors, and electrical devices.
Topics
Chemical Substances - Nature and Behaviour (Chemistry)
Chemical Reactions and Equations
- Chemical Equation
- Balancing Chemical Equation
- Types of Chemical Change or Chemical Reaction
- Direct Combination (or Synthesis) Reaction
- Decomposition Reactions
- Single Displacement Reactions
- Double Displacement Reaction
- Oxidation, Reduction and Redox Reactions
- Corrosion of Metals
- Rancidity of Food and Its Prevention
World of Living (Biology)
Acids, Bases and Salts
- Acids
- Bases (Alkalis)
- Indicators
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- Properties of Bases (Alkalis)
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- Important Salts in Daily Life
- Preparation and Uses of Sodium Hydroxide
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- Preparation and Uses of Plaster of Paris
Metals and Non Metals
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- Ionic or Electrovalent Bond
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Natural Phenomena (Physics)
Carbon and its Compounds
- Carbon: a Versatile Element
- The Covalent Bond
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- Ethanol
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Effects of Current (Physics)
Life Processes
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Natural Resources
Periodic Classification of Elements
- History of Periodic Table: Early Attempts at the Classification of Elements
- Dobereiner’s Triads
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Control and Co-ordination
- Control and Co-ordination in Human Being
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- Neuron (Or Nerve Cell) and Its Types
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- Plant Hormones
- Types of Plant Hormones: Auxins
- Types of Plant Hormones: Gibberellins
- Types of Plant Hormones: Ethylene
- Types of Plant Hormones: Cytokinins
- Types of Plant Hormones: Abscisic Acid (ABA)
- Types of Plant Hormones: Ethylene
- Hormones in Animals
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- Pituitary Gland or Hypophysis Gland
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Internal assessment
How do Organisms Reproduce?
- Accumulation of Variation During Reproduction
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- Accumulation of Variation During Reproduction
- Heredity or Inheritance
- Gregor Johann Mendel – Father of Genetics
- Monohybrid Cross
- Gregor Johann Mendel – Father of Genetics
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Light - Reflection and Refraction
- Reflection of Light
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- Image Formation by Convex Mirror
- Sign Convention
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- Refraction of Light Through a Rectangular Glass Slab
- Refractive Index
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- Concave Lens
- Images Formed by Concave Lenses
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- Sign Convention
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- Power of a Lens
The Human Eye and the Colourful World
- Human Eye
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- Eye Defect and Its Correction: Myopia Or Near-sightedness
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- Care of the Eyes
- Refraction of Light Through a Prism
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Electricity
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- Potential and Potential Difference
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- Effects of Electric Current
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- Electrical Power
Magnetic Effects of Electric Current
- Magnetic Effect of Electric Current
- Magnetic Field
- Properties of magnetic lines of force
- Magnetic Field Due to a Current Carrying Straight Conductor
- Right-hand Thumb Rule
- Magnetic Field Due to Current in a Loop (Or Circular Coil)
- Magnetic Field Due to a Current Carving Cylindrical Coil (or Solenoid)
- Force on a Current Carrying Conductor in a Magnetic Field
- Electric Motor
- Electromagnetic Induction
- Faraday's Laws of Electromagnetic Induction
- Electric Generator
- Alternating Current (A.C.) Generator
- Direct Current Motor
- Household Electrical Circuits
- Distinction Between an A.C. Generator and D.C. Motor
- Types of Current
Our Environment
Sources of Energy
- Source of Energy
- Conventional energy resources or non-renewable energy resources
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- Heat Energy (Thermal Energy)
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- Energy from the Sea
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- Nuclear Fission
- Forms of Energy
- Environmental Consequences
- How Long Will an Energy Source Last Us?
Sustainable Management of Natural Resources
- Sustainability of Natural Resources
- Case Study: Ganga Pollution and Ganga Action Plan
- Solid Waste Management
- Five R’s of Waste Management
- Protecting our environment
- Forests: Our Lifeline
- Stakeholders of Forest
- Conservation of Forest
- Conservation of Wildlife
- Water Management (Conservation of Water)
- Fresh Water Management
- Non-crystalline/Amorphous Forms: Coal
- Petroleum
- Conservation of Coal, Petroleum, and Natural Resources
- Overview of Natural Resource Management
- Introduction
- Experiment
Introduction:
Experiment
1. Aim: To observe the effect of a magnet on nearby objects and understand the concept of a magnetic field using iron filings.
2. Requirements: bar magnet, pins, cardboard, iron filings, plastic bottle, and bucket of water.
3. Procedure 1: Effect of a Magnet on Pins
- Spread some pins on a surface, ensuring they don’t stick together.
- Slowly move the bar magnet toward the pins.
- Observe as the pins get attracted to the magnet, even from a distance.
Observation: The magnet pulls the pins towards it, showing that it has a force that acts at a distance.
4. Procedure 2: Magnetic Field Lines with Iron Filings
- Place a bar magnet at the centre of a small piece of cardboard.
- Sprinkle iron filings on the cardboard around the magnet.
- Observe the pattern the iron filings have created by gently tapping the cardboard.
Observation: The iron filings arrange themselves in specific patterns, forming curved lines between the two poles of the magnet.
Magnetic field
5. Conclusion: The magnetic field is the region around the magnet where magnetic forces act. The iron filings align along invisible lines called magnetic lines of force that connect the two poles of the magnet. The magnetic field is strong where the force lines are closely packed. Where the lines are sparse, the field is weaker. Michael Faraday named these lines and explained that magnetic forces travel through these invisible lines of force.
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