# Shared Flashcard Set

## Details

Magnetism
Magnetism
13
Physics
11/14/2008

Term
 Cut a magnet in half
Definition
 you don't get a north pole and a south pole, you get 2 smaller magnets
Term
 Magnetic Field (4)
Definition
 decide direction by right hand ruleFB = qv x BFB = qvBmagnetic force is perpendicular to magnetic field direction
Term
 1 Gauss (G)
Definition
 1 G = 10-4 T
Term
 Force on an electric charge moving in a magnetic field (2)
Definition
 F = qvBsinθif the charged particle is moving perpendicular to a uniform magnetic field, it's path is a circle
Term
 force between 2 parallel wires
Definition
 parallel currents attract, antiparallel currents repel[image]
Term
 Solenoid (2)
Definition
 tightly wrapped, long coil of wire where the interior magnetic field is almost uniforminserting a piece of iron greatly increses the magnetic field and creates an electromagnet
Term
 Ampere's law
Definition
 calculates magnetic fields in situations with a high degree of symmetry
Term
 Torque (τ) on a current loop
Definition
 τ=MBsinθ=NIABsinθ
Term
 Magnetic dipole moment
Definition
 M=NIAN=# of loopsA=area of coil
Term
 Electric Motor
Definition
 uses torque on a current loop to change electrical energy to mechanical energy
Term
 Loudspeakers
Definition
 magnet exerts a force on a current-carrying wire, converts electrical signals into mechanical vibrations
Term
 Mass spectrometer (2)
Definition
 measures masses of atomscharged particle sent through perpendicular E and B fields, they hit the second B field, the radius of curvature depends on mass
Term
 Biot-Savart law
Definition
 B = µi/(2∏r)(µ=mag constant)
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