AP Physics C E&M: Magnetic Forces and Fields

gauss, G

unit of the magnetic field strength; 1 G = 10^−4 T

helical motion

superposition of circular motion with a straight-line motion that is followed by a charged particle moving in a region of magnetic field at an angle to the field

magnetic field lines

continuous curves that show the direction of a magnetic field; these lines point in the same
direction as a compass points, toward the magnetic south pole of a bar magnet

magnetic force, F

The force on a charged particle due to its motion in a magnetic field; the cross product of a charged particle's velocity and the magnetic field times the charge.

magnetic field, B

A field generated by charged particles in motion that exerts a force on other moving charged particles.

motor (dc)

loop of wire in a magnetic field; when current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft; electrical energy is converted into mechanical work in the process

north magnetic pole

The pole of a magnetic from which magnetic field lines point away from.

right-hand rule-1

using your right hand to determine the direction of either the magnetic force, velocity of a charged
particle, or magnetic field

right-hand rule-2

using your right hand to determine the direction of either the current or the magnetic field created by a wire

south magnetic pole

The pole of magnet to which magnetic field lines point.

tesla, T

SI unit for magnetic field: 1 T = 1 N/A*m

repel, attract

Like magnetic poles ___________, and unlike magnetic poles ___________.

monopole

An individual pole (___________) cannot be isolated; there is always a corresponding magnetic pole for each north or south pole.

current

Electric ___________ is the source of all magnetic phenomena.

electrons

Permanent magnets are created by alignment of spinning ___________.

force

The magnetic field is defined by the ___________ that a charged particle experiences while moving in this field.

loops

Magnetic field lines are closed ___________.

uniform, helical

Uniform magnetic fields cause ___________ and ___________ motion.

create

Current-carrying wires ___________ magnetic fields and feel forces due to external magnetic fields.

work

Magnetic forces are always perpendicular to velocity and mangetic field; therefore, the magnetic force can do no ___________.