Electromagnetism in Wires and Solenoids Flashcards
Electricity and Magnetism are very
closely related, since both are based on
the properties of _____________.
electrically charged particles
The Electromagnetic force is one of the
four fundamental forces in nature
(including the ______ ________ _______).
strong nuclear, the weak nuclear, and gravity
When an electric current moves through
a wire, a ________ _____ is produced.
magnetic field
The magnetic field exists in ________ _____ around a straight conductor.
circular rings
The direction of the magnetic field
depends on the direction of the _________.
current
Oersted’s principle: Whenever a
charge moves through a straight
conductor, a ______________________.
circular magnetic field is created around the conductor
The Right-hand Rule:
when holding a straight conductor with your right
hand and thumb pointing in the direction of
_________ _______, your curled fingers will
point in the direction of the magnetic field lines.
conventional current
if the wires
are parallel and the currents are going in
opposite directions, the magnetic field lines will
both be going _____ in the region between
them.
down
Since the magnetic field lines are going in the
_______ _______ in this region, we will have a
_________. The wires will be pushed _____
from one another!
same direction; repulsion; apart
Using similar reasoning, we would
conclude that two parallel wires with
currents going in the same direction
would ________ one another.
attract
A current in a _______ of wire will produce
_________ _______ ______ around the
wire and a straight-line field inside the
center of the loop.
loop; circular magnetic fields
A current in a coil of wire (many loops),
otherwise known as a _________, will produce a
magnetic field that is similar to that of a ____ ________.
solenoid; bar magnet
Each loop produces a magnetic field. All of the
magnetic fields _____ ____________ to create the
overall effect that is similar to a bar magnet.
add together
The field lines outside the solenoid is __________ than inside it
weaker
This gives us a way to produce an
electrically powered bar magnet – one
we can turn on and off. This type of
magnet is called an ___________.
electromagnet
