Magnetism Flashcards
(53 cards)
What is the unit of electric current?
Ampere
True or False: Electrons have a positive charge.
False
Fill in the blank: The force between two charged objects is described by _____’s Law.
Coulomb
What is the formula for Ohm’s Law?
V = I × R
What does the term ‘voltage’ refer to?
The electric potential difference between two points
Which of the following is a conductor? A) Wood B) Copper C) Rubber
B) Copper
What is the primary cause of magnetism?
The motion of electric charges
True or False: A magnetic field can do work on a charged particle.
True
Fill in the blank: The region around a magnet where magnetic forces can be detected is called the _____ field.
magnetic
What is the relationship between electricity and magnetism in electromagnetism?
Electricity can produce magnetic fields and vice versa.
What is the SI unit of electric charge?
Coulomb
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 opposition to the flow of electric current?
Resistance
True or False: Magnetic poles can exist independently.
False
What device is used to measure electric current?
Ammeter
What is the effect of increasing resistance on current, assuming voltage remains constant?
The current decreases.
Fill in the blank: The magnetic field lines exit from the _____ pole and enter the _____ pole.
north; south
What is the term for a material that can be magnetized?
Ferromagnetic material
Which law describes how a changing magnetic field can induce an electric current?
Faraday’s Law of Electromagnetic Induction
What is capacitance?
The ability of a system to store electric charge
True or False: Alternating current (AC) flows in one direction only.
False
What is the primary function of a transformer?
To change the voltage of alternating current
What type of circuit has only one path for current to flow?
Series circuit
