SOME BASIC PRINCIPLES OF MAGNETISM

What are the two types of magnetic poles?

• The two types of magnetic poles are the East Pole and the West Pole.

• The two types of magnetic poles are the North Pole and the South Pole.

• The two types of magnetic poles are the Positive Pole and the Negative Pole.

• The two types of magnetic poles are the Up Pole and the Down Pole.

Answer explanation

The two types of magnetic poles are the North Pole and the South Pole. These poles are responsible for the attraction and repulsion of magnets.

What is a magnetic field?

• A magnetic field is a type of radiation emitted by electronic devices

• A magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts.

• A magnetic field is a type of force field that repels all metal objects

• A magnetic field is a type of energy that can be harnessed for power generation

Answer explanation

A magnetic field is a region where magnetism acts, surrounding a magnetic material or a moving electric charge.

Name one example of a magnetic material.

• Wood

• Plastic

• Iron

• Glass

Answer explanation

Iron is an example of a magnetic material. It is attracted to magnets and can be used to create magnetic fields.

What is the force of attraction or repulsion between magnetic poles called?

• Gravitational force

• Electric force

• Frictional force

• Magnetic force

Answer explanation

The force of attraction or repulsion between magnetic poles is called magnetic force.

What is electromagnetism?

• Electromagnetism is the study of ocean currents

• Electromagnetism is the study of ancient civilizations

• Electromagnetism is the study of plant biology

• Electromagnetism is a branch of physics that deals with the study of electromagnetic force

Answer explanation

Electromagnetism is a branch of physics that studies the electromagnetic force, which is the interaction between charged particles.

What happens when like poles of two magnets are brought close to each other?

• Attraction occurs.

• Repulsion occurs.

• They repel each other.

• No interaction happens.

Answer explanation

When like poles of two magnets are brought close to each other, repulsion occurs.

How can you demagnetize a magnet?

• You can demagnetize a magnet by heating it to a high temperature or by subjecting it to a strong magnetic field in the opposite direction.

• You can demagnetize a magnet by hitting it with a hammer

• You can demagnetize a magnet by exposing it to sunlight

• You can demagnetize a magnet by freezing it at a low temperature

Answer explanation

To demagnetize a magnet, heat it or subject it to a strong magnetic field in the opposite direction.

What is the difference between a permanent magnet and an electromagnet?

• A permanent magnet is made of steel, while an electromagnet is made of copper

• A permanent magnet retains its magnetism without the need for an external current, while an electromagnet only becomes magnetic when an electric current flows through it.

• A permanent magnet is only used in small devices, while an electromagnet is used in large machinery

• A permanent magnet is always turned on, while an electromagnet can be turned off

Answer explanation

A permanent magnet retains its magnetism without the need for an external current, while an electromagnet only becomes magnetic when an electric current flows through it.

What is the unit of measurement for magnetic field strength?

• Watt (W)

• Newton (N)

• Joule (J)

• Tesla (T).

Answer explanation

The unit of measurement for magnetic field strength is Tesla (T).

How does the Earth act like a giant magnet?

• The Earth acts like a giant magnet because it has a large number of magnets embedded in its core.

• The Earth acts like a giant magnet because it is located in the magnetic field of the sun.

• The Earth acts like a giant magnet because it has a magnetic field generated by the movement of molten iron in its outer core.

• The Earth acts like a giant magnet because it is made of magnetic materials like iron and nickel.

Answer explanation

The Earth acts like a giant magnet due to the magnetic field generated by the movement of molten iron in its outer core.