Topics
Matter
Physical Quantities and Measurement
- Measurements
- Unit and Its Types
- Unit Systems
- Physical Quantities
- Rules and Conventions for Writing SI Units and Their Symbols
- International System of Units (Si System)
- Unit Prefixes
- Measurement of Length
- Devices for Measuring Length
- Measurement of Mass
- Devices for Measuring Mass
- Measurement of Time
- Devices for Measuring Time
- The Temperature and a Thermometer
- Measuring Temperature
- Area and It’s Unit
- Measurement of Area
Force
- Force - Push or Pull
- Effect of Force
- Types of Force: Contact Force
- Types of Force: Non-Contact Force
- Force of Friction
- Effects of Friction
- Kinds of Friction
- Advantages and Disadvantage of Friction
- Increasing and Reducing Friction
Energy
- Concept of Work
- Energy
- Machines
- Principle of Machine
- Efficiency of a Machine
- Simple Machines
- Mechanical Advantage
- A Lever
- Types of Levers
- A Pulley
- A Wheel and Axle
- An Inclined Plane
- A Wedge
- Screw
- Care of Machines
- Machines (Numerical)
Light
Magnetism
- Discovery of Magnets
- Classification of Magnets
- Magnetic and Non-magnetic Materials
- Magnet
- Magnetic Properties
- Magnetic Field
- Earth’s Magnetism
- Making a Magnet
- Electromagnet
- Making of an Electromagnet
- Applications of Electromagnets
- Care and Storage of Magnets
- Demagnetization of a Magnet
Care and Storage of Magnets:
Magnets can lose their magnetic properties when they are not handled properly. Exposure to heat, sudden impacts like drops or knocks, or being broken into pieces can all damage a magnet.
- Never expose magnets to heat (like fire or hot surfaces). Heat can demagnetise a magnet, which means it will lose its magnetic strength.
- Avoid dropping, hitting, or throwing magnets. Rough handling can alter the alignment of the magnetic particles inside the magnet, weakening its magnetic force.
- When storing magnets, it's helpful to place a piece of soft iron with them. This soft iron piece is known as a magnet keeper.
- The keeper helps to maintain the strength of the magnet by completing a magnetic circuit, which reduces the chance of the magnet getting demagnetised.
- It’s also important to keep magnets away from electronic devices because their magnetic fields can interfere with or damage electronic components.
Guarding a magnet
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