Midterms (Chapter 13. Part 1) Flashcards
(22 cards)
Common Examples of Magnetic Materials
Iron, nickel, and cobalt
The pole of a magnet that seeks the geographic North Pole of the Earth is called
North Pole
Opposite magnetic Poles are (attracted or repel)
attracted
An electromagnet need current from an
external source to provide a magnetic field
Permanent magnets retain their
magnetism
Any magnet has an _____ field of force out side the magnet, indicated by magnetic field lines
invisible
Any magnet has an invisible field of force out side the magnet, indicated by
magnetic field lines
magnetic field lines direction
from the north to the south pole
The open ends of a magnet where it meets a nonmagnetic material provide ______
magnetic poles
at opposite ends, the poles have _____ polarity
opposite
A magnet with an air gap has ______ with magnetic lines of force across the gap
oppositve poles
A clodes magnetic ring has ____ poles
no
_________ enables the field of a magnet to induce magnetic pole in a magnetic material without touching
Magnetic Inductions
_________ is the ability to concentrate magnetic flux
Permeability
A good magnetic material has _____ permeability
high
______ means isolating a component from a magnetic field
magnetic shielding
______ is a small voltage generated across the width of a conductor carrying current its length, when magnetic flux is applied perpendicular to the current
Hall Voltage
Flux or total lines formula
flux density (B) x Area
Flux or Total Lines SI unit
1 Weber (Wb) = 10^8 Maxwell (Mx)
Flux Density or Lines per unit area formula
Flux / area
Flux density SI unit
1 Tesla (T) = 1 Wb/m^2
