Magnetism and Electromagnetism - SS1 Physics Past Questions and Answers - page 1
Which of the following is a property of magnets?
Conductivity
Elasticity
Magnetism
Transparency
What is a magnetic field?
The area surrounding a magnet where magnetic forces can be detected
The physical substance that magnets are made of
The force that attracts or repels objects
The energy stored in a magnet
What is the primary difference between a permanent magnet and a temporary magnet?
Permanent magnets have a stronger magnetic field
Permanent magnets can be easily demagnetized
Temporary magnets only attract certain materials
Temporary magnets lose their magnetism over time
How can a magnet be demagnetized?
By increasing the temperature
By exposing it to a strong magnetic field
By dropping it from a height
By coating it with a non-magnetic material
Which of the following materials is most strongly attracted to a magnet?
Wood
Plastic
Iron
Glass
What happens when two magnets are brought close to each other with their like poles facing?
They attract each other
They repel each other
They become neutral
They rotate around each other
Explain the concept of magnetism and how it relates to the behaviour of magnets.
Magnetism is a phenomenon associated with certain materials that exert attractive or repulsive forces on other magnetic materials. Magnets have two poles, known as the north pole and the south pole, which interact with each other. Like poles repel each other, while opposite poles attract. This behaviour is due to the alignment of magnetic domains within the material, which creates a magnetic field around the magnet. The magnetic field is responsible for the forces and interactions observed in magnets.
Discuss the difference between permanent magnets and temporary magnets, providing examples of each.
Permanent magnets retain their magnetism over a long period of time and do not easily lose their magnetic properties. Examples of permanent magnets include bar magnets, horseshoe magnets, and magnets made of materials like neodymium or ferrite. Temporary magnets, on the other hand, only exhibit magnetism when they are in the presence of a strong magnetic field. Once the external magnetic field is removed, they lose their magnetism. Soft iron is an example of a temporary magnet.
When two magnets with like poles facing each other are brought close together, what happens?
They attract each other
They repel each other
No interaction occurs
The interaction depends on the strength of the magnets
What is the SI unit of magnetic field strength?
Tesla
Ampere
Newton
Coulomb
Explanation: The SI unit of magnetic field strength is the tesla (T). It is named after the inventor Nikola Tesla and is a measure of the strength and intensity of a magnetic field.