# Shared Flashcard Set

## Details

Test 3
Physics 3
28
Physics
11/02/2011

Term
 magnetic forces act
Definition
 only on moving charges
Term
 magnetic field
Definition
 A moving charge or a current creates a magnetic field in the surroundingspace (in addition to its electric field)
Term
 The magnetic field exerts
Definition
 a force F on any other moving charge or currentthat is present in the field.
Term
 magnetic field is a
Definition
 vector field-that is, a vector quantityassociated with each point in spaceu
Term
 magnetic field B points
Definition
 out of its northpole and into its south poled
Term
 magnitude of magnetic force is proportional
Definition
 to the magnitude of the charge
Term
 magnitude, or "strength," of the field;is proportional
Definition
 to the magnitude of the force
Term
 magnetic force depends
Definition
 on the particle's velocity.
Term
 A charged particle at rest experiences how much magnetic force?
Definition
 no magneticforce
Term
 magnetic force F does not havethe same direction as the magnetic field B but instead is
Definition
 always perpendicular toboth B and the velocity
Term
 so magnetic force F =
Definition
 qvBsin(0)
Term
 B =
Definition
 magnetic field
Term
 units of B
Definition
 1 tesla (T) or N/A*m
Term
 The total force F is the vector sum of the electric and magnetic forces
Definition
 q(E x V x B)
Term
 magnetic field lines point
Definition
 in the same direction acompass would north to south
Term
 dot ( . ) to represent a magnetic field line vector directed
Definition
 out of the plane
Term
 cross (X) to represent a magnetic field line vector directed
Definition
 into the plane
Term
 The total magnetic flux through the surface is the sum of the contributions fromthe individual area elements:�
Definition
 integral(Bcos * dA)
Term
 Magnetic flux is a
Definition
 scalar quantity
Term
 SI unit of magnetic flux is
Definition
 T·m^2 or N·m/A
Term
 The total magnetic flux through a closed surface is
Definition
 always zero
Term
 Magnetic field lines have no ends
Definition
 they form closed loops through the interior of the magnet
Term
 magnetic fiux density
Definition
 magnitude of magnetic field is equal to flux per unit area across anarea at right angles to the magnetic field
Term
 magnetic force is perpendicular to
Definition
 the velocity
Term
 magnetic force can
Definition
 can never do work on the particle
Term
 magnetic force F on a current carrying conductor
Definition
 I*l*B or Idl x B
Term
 magnetic dipole moment mu =
Definition
 IA
Term
 magnetic torgue =
Definition
 mu x B
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