Magnetism and Its Applications

What is a magnetic field?

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

• The force that holds the nucleus of an atom together

• The process of creating a temporary magnet by stroking an iron or steel rod with a magnet

• A type of energy that can be harnessed for power generation

How is an electromagnet created?

• Dropping a magnet on a piece of iron

• Exposing iron to extreme heat

• Rubbing a piece of iron with a magnet

• Passing an electric current through a coil of wire wrapped around an iron core

What is the magnetic force?

• Force exerted by a magnetic field on a moving electric charge

• Force exerted by gravity on a magnetic object

• Force exerted by a magnetic field on a stationary electric charge

• Force exerted by air on a magnetic material

What are the two types of magnetic poles?

• North pole and South pole

• East pole and West pole

• Positive pole and Negative pole

• Top pole and Bottom pole

Name a few examples of magnetic materials.

• Water, air, paper

• Aluminum, copper, brass

• Iron, nickel, cobalt, rare earth metal alloys

• Wood, plastic, glass

Explain the concept of magnetic induction.

• Magnetic induction is the process of generating electricity using a magnetic field.

• Magnetic induction is the process of creating a magnetic field around a material.

• Magnetic induction is the process of demagnetizing a material in a magnetic field.

• Magnetic induction is the process by which a material becomes magnetized when it is placed in a magnetic field.

Differentiate between ferromagnetic and non-ferromagnetic materials.

• Ferromagnetic materials are repelled by magnets

• Ferromagnetic materials cannot be magnetized

• Ferromagnetic materials can be strongly attracted to magnets and can be magnetized, while non-ferromagnetic materials are weakly attracted to magnets and cannot be magnetized.

• Non-ferromagnetic materials are strongly attracted to magnets

How are credit and debit cards related to magnetism?

• They have no relation to magnetism

• They are related to magnetism through the use of barcodes

• They are related to magnetism through the use of radio waves

• They are related to magnetism through the use of magnetic stripes to store data.

What is the use of MRI in the medical field?

• To measure blood pressure

• To produce detailed images of the body's external structures

• To diagnose skin conditions

• To produce detailed images of the body's internal structures