Electromagnetism Flashcards
(26 cards)
What is the fundamental force that governs electromagnetism?
The electromagnetic force.
True or False: Electromagnetism is one of the four fundamental forces of nature.
True.
Fill in the blank: The unit of electric charge is the __________.
coulomb.
What is the relationship between electric current and magnetic fields?
An electric current produces a magnetic field.
Which law describes the relationship between voltage, current, and resistance?
Ohm’s Law.
What is the formula for calculating the magnetic force on a charged particle?
F = q(v × B), where F is the force, q is the charge, v is the velocity, and B is the magnetic field.
What does Faraday’s Law of Electromagnetic Induction state?
A change in magnetic field within a closed loop induces an electromotive force (emf) in the loop.
Multiple Choice: What is the SI unit of magnetic flux?
Weber.
What phenomenon occurs when a conductor moves through a magnetic field?
Electromagnetic induction.
True or False: Magnetic field lines can cross each other.
False.
Fill in the blank: The right-hand rule is used to determine the direction of __________.
magnetic force.
What is the formula for calculating electric power?
P = IV, where P is power, I is current, and V is voltage.
What is the primary source of a magnetic field in a magnet?
The motion of electrons.
Multiple Choice: Which of the following is a property of magnets?
They have north and south poles.
What is the principle behind a transformer?
Electromagnetic induction.
True or False: Electric fields can exist in a vacuum.
True.
What is the term for the opposition that a material offers to the flow of electric current?
Resistance.
Fill in the blank: The magnetic field is represented by __________ lines.
field.
What type of materials can be magnetized?
Ferromagnetic materials.
What is the effect of increasing the current in a solenoid?
The magnetic field strength increases.
Multiple Choice: Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points?
Ohm’s Law.
What is the term for the region around a charged particle where its electric field is present?
Electric field.
What is the purpose of a capacitor in an electric circuit?
To store electrical energy.
True or False: Electromagnetic waves can travel through a vacuum.
True.
