Magnetic Forces and Fields Flashcards
Magnets have 2 types of magnetic poles called
The north magnetic pole and the south magnetic pole
North magnetic poles are those that
are attracted toward Earth’s geographic North Pole
Like pole___________ and unlike poles__________
repel
attract
Charges moving across a magnetic field experience a force determined by______________.
The force is perpendicular to the plane formed by_______________.
Magnetic fields can be pictorially represented by magnetic field lines, which have the following properties:
- The field is tangent to the magnetic field line
- Field strength is proportional to the line density.
- Field lines cannot cross.
- Field lines form continuous, closed loops.
Magnetic poles always occur in pairs of __________ and __________
north
south
it is not possible to isolate north and south poles.
A magnetic force can supply centripetal force and cause a charged particle to move in a circular path of radius___________
The period of circular motion for a changed particle moving in a magnetic field perpendicular to the plane of motion is _______________
An electric current produces a ____________around the __________.
magnetic field
wire
The magnetic force on current-carrying conductors is given by
where I is the current and L is the length of a wire in a uniform magnetic field B
The net force on a current-carrying loop of any plane shape in a uniform magnetic field is ____________.
zero
The net torque T on a current-carrying loop of any shape in a uniform magnetic field is calculated using___________.
Magnitude of magnetic force
Magnetic dipole moment
Energy of magnetic dipole
Drift velocity in crossed electric and magnetic fields
The magnetic field created by a current-carrying wire is found by the
Biot-Savart law
Permeability of free space
Contribution to magnetic field from a current element
Magnetic field due to a long straight wire
Force between two parallel currents
The magnetic field strength at the center of a circular loop is given by
