Topics
Physical Quantities and Measurement
- Measurements
- Physical Quantities
- Volume and It’s Unit
- Measurement of Volume
- Area and It’s Unit
- Measurement of Area
- Density and It’s Unit
- Measurement of Density
- Determination of Density of a Regular Solid
- Determination of Density of an Irregular Solid
- Determination of Density of a Liquid
- Speed
Force and Pressure: Motion
Energy
- Concept of Energy
- Forms of Energy > Solar Energy
- Forms of Energy > Mechanical Energy
- Mechanical Energy > Potential Energy (U)
- Mechanical Energy > Kinetic Energy (K)
- Types of Kinetic Energy
- Conversion of Potential Energy into Kinetic Energy
- Conversion of Energies
- Principle of Conservation of Energy
- Electricity Generation using Hydroelectric Energy
Light Energy
- Climatic Factors > Light
- Reflection of Light
- Plane Mirror
- Terms Used in Reflection of Light
- Law of Reflection of Light
- Verification of the Law of Reflection of Light
- Reflection of a Ray of Light Normally Incident on a Plane Mirror
- Images Formed by a Plane Mirrors
- Formation of Image by Reflection: Real and Virtual Image
- Lateral Inversion
- Types of Reflection
- Speed of Light in Different Media
- Colour
Heat
Sound
Electricity and Magnetism
- Magnet
- Discovery of Magnets
- Classification of Magnets
- Magnetic Properties of Materials
- Laws of Magnetism
- Magnetic Field
- Electromagnet
- Making of an Electromagnet
- Uses of Electromagnet
- Electric Bell
- Earth’s Magnetic Declination
- Electricity
- Sources of Electricity
- Electric Circuit
- Electrical Conduction in Solids
- Analogy of Electric Current with Water Flow
- Flow of Charges (Electrons) Between Conductor
- Symbols and Functions of Various Components of an Electric Circuits
- Types of Circuits: Series Circuit
- Types of Circuits: Parallel Circuit
- Electric cell
- Battery
- Introduction
- Experiment
Maharashtra State Board: Class 6
Introduction:
Magnetism is a force that pulls or pushes objects made of certain metals like iron, nickel, and cobalt. A magnet has two ends called poles-North and South. Opposite poles attract each other, and like poles repel (push away) each other.
- The force created by a magnet is called magnetic force. This force can act from a distance without touching the object.
- Magnetic force can move or lift objects, showing that it is a type of energy.
- In factories, ports, or garbage depots, cranes with powerful magnets are used to lift and move heavy metal objects like cars or metal scraps.
Maharashtra State Board: Class 7
Experiment
1. Aim: To magnetise a steel bar using the single-touch and double-touch methods and compare the magnetism produced by both methods.
2. Requirements: steel bar, bar magnet(s), iron filings, and thread.
3. Procedure
I. Single-Touch Method
- Place the steel bar AB on a table.
- Take a bar magnet and place its N pole on the A end of the steel bar.
- Drag the magnet towards the B end and then lift it.
- Repeat the process 15-20 times.
- Now bring the steel bar near iron filings and observe.
- Hang the bar freely on a thread and observe its behaviour.
Observation: The steel bar shows weak magnetism for a short period.
II. Double-Touch Method
- Place the steel bar on a table.
- Take two bar magnets. Place opposite poles (e.g., N of one magnet, S of the other) at the centre of the steel bar.
- Drag one magnet to the A end and the other to the B end of the bar.
- Repeat the process 15-20 times.
- Now bring the steel bar near iron filings and observe.
Observation: The steel bar shows stronger magnetism that lasts longer than the single-touch method.
4. Conclusion
- Single-Touch Method: produces weak and short-lasting magnetism.
- Double-Touch Method: produces stronger and longer-lasting magnetism.
This experiment shows that different methods of magnetisation affect the strength and duration of the magnetic properties.
