Chapter 27: Electromagnetic Fields Flashcards
What is an electromagnetic field?
“An electromagnetic field is a field produced by electrically charged particles
What is the relationship between electricity and magnetism?
“Electricity and magnetism are closely related. A changing electric field creates a magnetic field
What is the concept of electric field strength?
“Electric field strength (E) is the force per unit charge exerted on a small test charge placed in an electric field. It is given by E = F/q.”
What is the concept of magnetic field?
“A magnetic field is a field that exerts a force on moving charged particles and magnetic materials. It is represented by magnetic field lines
What is the formula for the magnetic force on a moving charge?
“The magnetic force on a moving charge is given by F = qvBsin(θ)
What is the right-hand rule?
“The right-hand rule is a method for determining the direction of the magnetic force on a moving charge. Point the fingers of your right hand in the direction of the velocity
What is the concept of magnetic flux?
“Magnetic flux (Φ) is the product of the magnetic field strength (B) and the area (A) through which the field lines pass
What is Faraday’s law of electromagnetic induction?
“Faraday’s law states that a changing magnetic flux through a coil of wire induces an electromotive force (emf) in the coil
What is Lenz’s law?
“Lenz’s law states that the direction of an induced current is always such that it opposes the change in magnetic flux that caused it. This is a consequence of the conservation of energy.”
What is the formula for induced emf?
“The induced emf (ε) is given by ε = -dΦ/dt
What is the concept of electromagnetic waves?
“Electromagnetic waves are waves that consist of oscillating electric and magnetic fields that propagate through space. They travel at the speed of light in a vacuum and include radio waves
What is the speed of an electromagnetic wave?
“The speed of an electromagnetic wave in a vacuum is the speed of light
What is the relationship between electric and magnetic fields in an electromagnetic wave?
“In an electromagnetic wave
What is the formula for the energy of an electromagnetic wave?
“The energy of an electromagnetic wave is given by E = hf
What is the concept of the electromagnetic spectrum?
“The electromagnetic spectrum is the range of all electromagnetic waves
What is the concept of the Lorentz force?
“The Lorentz force is the total force experienced by a charged particle moving in an electromagnetic field. It is the sum of the electric and magnetic forces: F = q(E + v × B).”
What is the equation for the magnetic force on a current-carrying wire?
“The magnetic force on a current-carrying wire is given by F = I L B sin(θ)
