In which direction will be the force on an electron moving in a magnetic the largest?
The same as the magnetic field direction.
Exactly opposite to the magnetic field direction.
Perpendicular to the magnetic field direction.
At an angle other than 90° to the magnetic field direction.
When does a change occur to electromagnetic induction in a coil?
electric field intensity in the coil
magnetic field intensity in the coil
voltage in the coil
the coil's polarity
The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
1000V
2000 V
31.25V
3125V
How is each piece when a bar magnet is broken in two?
as magnetic as the original magnet
actually stronger than the original magnet
half as strong as the original magnet
no longer magnetic.
What does a moving charged particle experience if it moves through a static magnetic field?
an acceleration in the current direction
a deflection that is parallel to the magnetic field
a deflection that is perpendicular to the current and parallel to the magnetic field
a deflection that is perpendicular to both the magnetic field and the current
Where does the term magnetism come from?
the interaction of relativistic electric fields on moving charges
from a region of Magnesia, a province of Italy
from a region of Magnesia, a province of Greece
the Latin term for “attraction of metal”
In rare earth magnets, such as gadolinium or neodymium what is the main contributor to the magnetic field?
electron spin
electron orbital motion
proton spin
Proton orbital motion
Which is not a material that is commonly used to make a magnet?
iron
cobalt
nickel
copper
All pieces of iron have magnetic domains, why are most iron nails not magnetic?
they cannot conduct electricity
their domains are all oriented with respect to magnetic poles
their domains are randomly oriented, canceling out most magnetic forces
their atoms contain 4 electrons that spin magnetism is un-cancelled
When does an iron rod become magnetic?
positive ions accumulate at one end and negative ions at the other end.
its atoms are aligned having plus charges on one side and negative charges on the other.
the net spins of its electrons are in the same direction.
its electrons stop moving and point in the same direction.
