magnetic fields Flashcards
where do the field lines go in a magnetic field
field lines always go from north to south in a magnetic field
what does the force on a current carrying wire in a magnetic wire depend on
length of the wire
the current
the strength of the magnetic field
when is the force on a current carrying wire in a magnetic field greatest
it is greatest when the wire is at right angles to the magnetic field
when is the force on a current carrying wire in a magnetic field zero
it is zero when the wire is parallel to the magnetic field
what is the motor effect?
The force on a current-carrying conductor due to a magnetic field
what is magnetic flux density
the force per unit length per unit current on a current carrying conductor at right angles to the magnetic field lines
what are hall probes used to measure
magnetic flux density
how does a hall probe work
a slice of semi conducting material
with the magnetic field perpdendicular to the material
constant current passes through
the charge carriers are deflected by field
potential difference between top and bottom is created as a results
what is the potential difference in a hall probe called and what is it proportional to
it is called the hall voltage
it is proportional to the magnetic flux density provided current is constant
why do charged particles travel in a circle in a magnetic field
as the force is perpendicular to the electron’s velocity
the path is a complete circle as the magnetic field and the particles remain inside the field
