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Science
Physics
Magnetism Review AP Physics 2
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Terms in this set (25)
poles
two ends of an object where the magnetic effect is the strongest e.g..north pole & south pole
ferromagnetic
showing strong magnetic effects, can be permanently magnetized
magnetic field
a force field that fills the space around every magnet or current-carrying wire; (B)
tesla
(T) unit of a magnetic field (B), 1T=1N/Am
electricity&magnetism
an electric current produces a magnetic field and vice versa
right hand rule1
grasp the wire with your right hand so that your thumb points in the direction of the conventional current, and your finger will encircle the wire in the direction of the magnetic field
Force on an electric current in a magnetic field
F = BIlsinθ
direction of the current is perpendicular to the field θ=90
Fmax=BIl
Force on an electric charge moving in a magnetic field
F = q v B sinθ
right hand rule2
outstretch your fingers point along the velocity of the particle then encircle to the direction of the electric field, thumb direction is the direction of the force exerted on the positive charge(negative the opposite)
magnetic field due to current in straight line
b=μ0I/2πr
permeability of free space
μ0=4πx 10^-7 T m/A
electromagnet
iron inside a solenoid, the magnetic field increases greatly because iron is a magnet
magnetic dipole moment
M=NIA
galvanometer
coil of wire suspended in the magnetic field of a permanent magnet, when current flows the magnetic field exerts a torque on the loop
magnetic force
acts on charged particle moving through a field, direction of force is given by a RHR
Ampere's Law
relates the current in any shape wire and the magnetic field it produces
induced current
changing in magnetic field can produce an electric current
Electromagnetic Induction
the process of creating a current in a circuit by changing a magnetic field
magnetic flux
Flux=BAcosθ
unit of magnetic flux
Weber (W) 1Wb=1Tm^2
Faraday's law of induction
The emf induced in a circuit is equal to the rate of change of magnetic flux thought the circuit (E=- (△mag flux)/△ t)
N loops (E=- N(△mag flux)/△ t)
Lenz's Law
A current produced by an induced emf moves in a direction so that the magnetic field created by that current opposes the original change in flux
emf induced in a moving conductor
emf=(△mag flux)/△ t=Blv
changing magnetic flux produces an electric field
E=vB
electric generator
Transforms mechanical energy into electric energy
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