Upload
jasper
View
29
Download
0
Tags:
Embed Size (px)
DESCRIPTION
AP Physics III.D. Magnetic Fields. III.D1 − Magnetic Fields. The prized lodestone. Force of one magnet on another. Magnetic field as plainly demonstrated by iron filings and compasses. The direction of a magnetic field. The Force of a Magnetic Field on a Moving Charge. - PowerPoint PPT Presentation
Citation preview
AP Physics III.D
Magnetic Fields
III.D1 − Magnetic Fields
The prized lodestone
Force of one magnet on another
Magnetic field as plainly demonstrated by iron filings and
compasses.
The direction of a magnetic field
The Force of a Magnetic Field on a Moving Charge
A magnetic field exerts a force on a charged particle when . . .
• The charge is moving
• The velocity of the moving charge has a component that is perpendicular to the direction of the field
Consider . . . 1) a magnetic field and the charge moving parallel or
antiparallel to the field
2) The charge moving at 90º to the direction of the field (time for
Right Hand Rule Number 1)
3) The charge moving between 0º and 180º to the direction of the
field
Note: for positive charges in a magnetic field use your right
hand. For negative charges in a magnetic field use your left hand.
Motion of a Charged Particle in a Magnetic Field
Work done on a charged particle moving through a electric and
magnetic fields
A for a handy formula which I never remember and is not a
“boxer” but one you can easily derive.
Ex. A particle with charge +q traveling with velocity v, enters a uniform magnetic field B, as shown below. Describe the particle’s motion.
B
+q
v
III.D.2 Force on a current carrying wire in a magnetic field
RHR-1 Again
Ex. A U-shaped wire of mass m is lowered into a magnetic field B that points in the plane of the page. What is the magnitude and direction of the current I that must pass through the wire if the net force on the wire is zero?
III.D.3 Magnetic fields produced by current-carrying wires
Electromagnetism – the linking of the motion of electric charges with
the creation of a magnetic field
Extraordinary Demo!
Right-Hand-Rule Number 2
+e
v0
I
Forces on parallel current carrying wires