Magnetism Flashcards
(37 cards)
What is magnetism?
Magnetism is a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.
True or False: All materials can be magnetized.
False
What are the two types of magnetic poles?
North and South poles.
Fill in the blank: Like poles _____ and unlike poles _____ each other.
repel; attract
What is the unit of magnetic field strength?
Tesla (T)
What is a magnet?
A magnet is an object that produces a magnetic field and can attract or repel other magnetic materials.
Multiple Choice: Which of the following materials is typically ferromagnetic? A) Copper B) Aluminum C) Iron D) Gold
C) Iron
What is the Earth’s magnetic field primarily generated by?
The movement of molten iron in its outer core.
True or False: Magnetic fields can be visualized using magnetic field lines.
True
What is the magnetic field around a straight current-carrying wire described by?
The right-hand rule.
Fill in the blank: The region around a magnet where magnetic forces can be detected is called the _____ field.
magnetic
What is the term for materials that are weakly attracted to magnets?
Paramagnetic materials.
Multiple Choice: Which of the following is a property of magnets? A) They have only one pole B) They can repel non-magnetic materials C) They always have a north and south pole D) They can be turned off
C) They always have a north and south pole
What is the phenomenon of magnetic induction?
The process by which a material becomes magnetized by an external magnetic field.
True or False: Magnetic fields can penetrate through most materials.
True
What do we call the magnetic field produced by a moving electric charge?
Electromagnetic field.
Fill in the blank: A _____ is a coil of wire that produces a magnetic field when an electric current passes through it.
solenoid
What is the term for the force exerted by a magnetic field on a charged particle?
Lorentz force.
Multiple Choice: Which device uses magnetism to store data? A) Hard drive B) Flash drive C) Optical disk D) Tape drive
A) Hard drive
What is the purpose of a magnetic shield?
To protect sensitive electronic equipment from external magnetic fields.
True or False: Permanent magnets can lose their magnetism over time.
True
What is the principle behind magnetic levitation?
Using magnetic forces to counteract gravitational forces, allowing objects to float.
Fill in the blank: The force between two magnetic poles is _____ proportional to the product of their strengths and _____ proportional to the square of the distance between them.
directly; inversely
What is the term for the area around a magnet where magnetic forces are observable?
Magnetic field.
