Flashcards in CYU Deck (23):
magnetic field start in the x and are terminated in the x
two magnetic poles:
N & S
Like poles x and unlike poles x
Can a resting electron interact with magnetic field?
Can a moving electric charge interact with magnetic field?
If a magnetic field exerts a force on a current,
that force is directed at a right angle to the current direction
Charged particles from sun are trapped by earth B field?
What fundamental fact underlies operation of electric motors?
A current-carrying conductor placed perpendicular to a magnetic field will experience a force
what is the source of all magnetism?
current moving charge
permanent bar magnet has b field. b field is due to
current in atom/electron motion
What is the cause of earth's magnetic field?
current: outer core (liquid iron) + rotation of earth
source of all magnetism:
why will heating a magnet weaken it?
Describe ampere's law
current creates magnetic field (electromagnetic)
Describe faraday's law
moving magnet changes electric field
There is an oscillating magnetic field inside the loop. What happens in ammeter?
move magnet, put coil nearby and current transfers
If there is current in coil even though no current source (ex. battery) is connected to coil, what is the source of the current?
1. move permanent magnet
2. move coil
in order to make changing b field
move magnet near wire or move coil near magnet or changing current in nearby wire. this is ampere's
rapid change of a magnetic field induces
name of device that transforms mechanical energy into electrical energy?