chapter 9 magnetism terms

question

Magnetic force
answer

(1) between magnets, the attraction of unlike magnetic poles for each other and the repulsion between like magnetic poles (2) between a magnetic field and a moving charged particle, a deflecting force due to the motion of the particle
question

Magnetic fields
answer

the region of magnetic influence around either a magnetic pole or a moving charged particle
question

Magnetic domains
answer

clustered regions of aligned magnetic atoms. When these regions are aligned with one another, the substance containing them is a magnet
question

Electromagnet
answer

a magnet whose field is produced by an electric current. Electromagnets are usually in the form of a wire coil with a piece of iron inside the coil
question

Electric motor
answer

a device that uses a current-carrying coil forced to rotate in a magnetic field to convert electrical energy to mechanical energy
question

Electromagnetic induction
answer

the induction of voltage when a magnetic field changes with time. if the magnetic field within a closed loop changes in any way, a voltage is introduced in the loop: voltage induced ~ number of loops X magnetic field change/time. this is a statement of Faraday’s law. The induction of voltage is the result of a more fundamental phenomenon: the induction of an electric field
question

Faraday’s law
answer

an electric field is induced in any region of space in which a magnetic field is changing with time. The magnitude of the induced electric field is proportional to the rate at which the magnetic field changes. The direction of the induced field is at right angles to the direction of the changing magnetic field
question

Generator
answer

an electromagnetic induction device that produces electric current by rotating a coil within a stationary magnetic field; converts mechanical energy to electrical energy
question

Transformer
answer

a device for transferring electric power from one coil of wire to another by means of electromagnetic induction, for the purpose of transforming one value of voltage to another
question

Maxwell’s counterpart to Faraday’s law
answer

a magnetic field is induced in any region of space in which an electric field is changing with time. The magnitude of the induced magnetic field is proportional to the rate at which the electric field changes. The direction of the induced magnetic field is at the right angle to the changing electric field

Get instant access to
all materials

Become a Member