magetism and electromagnetism physics Flashcards
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: The unit of magnetic field strength is the _______.
Tesla
What is the right-hand rule used for?
To determine the direction of the magnetic force, magnetic field, and current in electromagnetism.
What is the primary cause of magnetism in materials?
The alignment of electron spins and orbits.
What is an electromagnet?
A type of magnet in which the magnetic field is produced by an electric current.
True or False: The Earth can be considered a giant magnet.
True
What is Faraday’s Law of Electromagnetic Induction?
It states that a change in magnetic field within a closed loop induces an electromotive force (EMF) in the loop.
Multiple Choice: Which of the following materials is a ferromagnet? A) Copper B) Iron C) Aluminum
B) Iron
What is the formula for calculating the force on a charged particle in a magnetic field?
F = q(v × B)
Fill in the blank: A device that converts electrical energy into mechanical energy using magnetic fields is called a _______.
Motor
What is the principle of magnetic induction used in transformers?
It allows the transfer of electrical energy between two or more coils through a changing magnetic field.
True or False: Magnetic field lines can cross each other.
False
What is the term for materials that can be easily magnetized and demagnetized?
Soft magnetic materials
What is the force acting on a current-carrying conductor placed in a magnetic field called?
Lorentz force
Multiple Choice: What does the term ‘flux’ refer to in magnetism? A) Strength of magnet B) Number of magnetic field lines passing through a surface C) Direction of magnetic field
B) Number of magnetic field lines passing through a surface
What is a magnetic field?
A region around a magnet where magnetic forces can be detected.
Fill in the blank: The device used to measure magnetic fields is called a _______.
Gaussmeter
True or False: The magnetic field inside a solenoid is uniform.
True
What is the phenomenon called when a material becomes magnetized in the presence of a magnetic field?
Magnetization
What type of magnetism is exhibited by materials that are weakly attracted to magnetic fields?
Paramagnetism
Multiple Choice: Which law relates the induced EMF to the rate of change of magnetic flux? A) Ohm’s Law B) Lenz’s Law C) Faraday’s Law
C) Faraday’s Law
What is the term for the area around a magnet where magnetic forces can be felt?
Magnetic field
