by richard j. terwilliger click on a created by richard j. terwilliger july 2001
TRANSCRIPT
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by
Richard J. Terwilliger
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Click on a
Created by
Richard J. Terwilliger
July 2001
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around current bearing wires
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Thumb points in the direction of electron flow.
Fingers curl around the wire in the direction of the
magnetic field.
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The magnetic field in front of the wire points towards the top of the page.
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The magnetic field behind the wire points towards the bottom of the page.
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The magnetic field above the wire points into the page.
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The magnetic field below the wire points out of the page.
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Again, The thumb of the
left hand points in the direction of
electron flow
The fingers curl around the wire in
the direction of the
magnetic field
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The magnetic field in front of the wire is to
the left
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The magnetic field on the
left side of the wire is back
into the page
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The magnetic field behind the wire is to
the right
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The magnetic field on the right side of the wire is
pointed out of the page
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Into the page is shown by
an X
Out of the page is
shown by a dot
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Into the page is shown by
an X
Out of the page is
shown by a dot
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Into the page is shown by
an X
Out of the page is
shown by a dot
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The current flow is now to the left
Grasp the wire with your hand
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The current flow is now to the left
The thumb points in the direction of
electron flow,the fingers curl
around the wire in the direction of the
magnetic field.
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The current flow is now to the left
The thumb points in the direction of
electron flow,the fingers curl
around the wire in the direction of the
magnetic field.
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The current flow is now to the left
The thumb points in the direction of
electron flow,the fingers curl
around the wire in the direction of the
magnetic field.
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Each of the following diagrams shows a section of wire that has
been enlarged.
Associated with each wire is the direction of current flow
and the magnetic field around the wire.
Determine which of the following diagrams are correct.
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Does the diagram at the right show the correct orientation of the magnetic field around the
current bearing wire?.
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Is the diagram at the left correct?
The diagram is…
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The diagram shows a compass placed above a
current bearing wire.
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The compass needle points into the page
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What is the direction of the current flow in the wire?
Click on your choice above.
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Shown here is a loop of wire
connected to a potential source.
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The electrons flow from the negative
terminal of the battery
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through the wire and back to the positive
terminal.
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through the wire and back to the positive
terminal.
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We know that when current flows
through a wire a magnetic field is
formed.
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to determine the direction of the magnetic field.
We use the
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Fingers curl in the direction of the magnetic field
The arrows show the
direction of electron flow.
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Grab the loop with your
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Curl your fingers around the loop in the same direction
as the electron flow.
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Your thumb now points
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The magnetic field on the
outside of the loop is from the
north pole to the south pole
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The magnetic field inside the
loop travels from the south
back to the north
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If we place a compass inside
the loop it points in the
direction of the flux lines
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Outside the loop a compass still points in the direction of the magnetic flux lines
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I’m back!
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Several LOOPS of wire are called a
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We also use the
to determine the magnetic field around a coil.
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To demonstrate the
we’ll start by building an electromagnet.
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To build an electromagnet or solenoid we start with a
cylinder.
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We could use one of the cardboard rolls found at the center of toilet paper rolls
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If the inside of the cylinder is hollow it is said to have
an air core.
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The front side of the coil is called the face
of the coil.
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We will start creating an electrical solenoid by wrapping wire around
the core.
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Each wrap is a loop of wire.
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and all the loops form a
coil
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Next attach a potential source
(battery)to the wire.
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The current will flow from the negative
terminal
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through the wire and back to the
positive terminal.
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The current flowed up the back of the
coil
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and down the front side or face of the
coil.
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Current flowing through the coil creates a
magnetic field.
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is used to determine the direction of the magnetic field.
The
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The next few slides will show how to apply the
to this coil.
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Grasp the coil with your left hand curling your fingers
around the coil in the direction
of electron flow.
Your thumb points to the
end of the coil
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The magnetic flux lines come
out of the NORTH, go around and
into the SOUTH.
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In what direction would a compass point if placed above the coil?
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A compass will point in the same direction as the magnetic flux lines at that point.
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Now we are going to replace this coil with another coil that
has the wire wrapped around in the opposite direction.
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The battery will still be connected with the negative
terminal on the left.
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Watch closely so you can see the difference.
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Watch closely so you can see the difference.
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The current still travels from the negative terminal
through the coil and back to to positive terminal.
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Notice that the electrons travel up the face of the coil, over the top
and down the back
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Notice that the electrons travel up the face of the coil, over the top
and down the back
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Use the
to determine the NORTH end of the coil.
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Grab the coil with your
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Your fingers will follow the electron flow.
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Curl your fingers over the top and down the
back.
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You thumb points to the
end of the coil.
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We now know the
end of the coil.
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and the
around the coil.
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Let’s try another example.
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We’ll start with another coil.
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The coil is attached to a potential source but the
polarity is unknown.
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We do know that
is on the bottom of the coil
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A
B
Using the
determine which is the negative terminal.
A B
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A
B
Grab the coil with your
so you thumb points
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A
B
Your fingers now curl in the direction of
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A
B
Your fingers now curl in the direction of
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A
B
B
The
must come from
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A
B
B
The
must come from
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A
B
Therefore is theB
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![Page 92: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/92.jpg)
Now the
![Page 93: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/93.jpg)
There are 3 partsto the
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An external magnetic field.
![Page 95: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/95.jpg)
Remember that the magnetic field goes from
to
![Page 96: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/96.jpg)
Either a charge moving across
the magnetic field.
![Page 97: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/97.jpg)
Or current flow through a conductor that is in the
magnetic field.
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A force acting on the moving charge or current bearing wire.
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I will now show you how
to apply the
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Point your fingers
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Or the same direction as the
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Your thumb points in the direction of negative
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And the
acting on the current bearing wire or moving negative charge is
out of the palm.
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![Page 105: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/105.jpg)
First point your fingers of your left hand
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Notice that your fingers point in the same direction
as the magnetic field shown by the symbol
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Your thumb points in the direction of negative current flow
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And the force acting on the moving charge or current bearing
wire is out of the palm.
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So the force acting on the wire is
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Let’s try another example
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Shown here is a current bearing wire placed
between the north and south poles of a horseshoe
magnet.
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The electron flow in the enlarged section of wire is
back into the page as shown by the arrows.
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We can find the direction of the force on the wire
using the
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Using your left hand point your fingers
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Now, keeping your fingers pointed south, rotate your hand
so you thumb points in the same direction as the
current flow.
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Now, keeping your fingers pointed south, rotate your hand
so you thumb points in the same direction as the
current flow.
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The force on this section of wire is out of your palm or
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Out of palm
Points at southNegative electron
flow
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A current bearing wire is place between two bar magnets.
What is the direction of the force on the wire?
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We know that the magnetic field between the bar magnets is from the north pole to the
south pole?
![Page 121: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/121.jpg)
We also know that the current (electron flow) is out of the
negative terminal, through the circuit and back to the positive
terminal.
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Therefore the current flow in the section of wire between the bar magnets
is toward the top of the page.
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We can now use the
to find the direction of the force on the wire.
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Point the fingers of your
in the direction of the magnetic field, south.
Fingers point south
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Your thumb points in direction if the negative
current flow.
Fingers point south
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The force on the wire is shown by a vector coming out of your
palm.
Fingers point south
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The force on the wire is shown by a vector coming out of your
palm.
![Page 128: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/128.jpg)
The force on the wire is shown by a vector coming out of your
palm.
![Page 129: by Richard J. Terwilliger Click on a Created by Richard J. Terwilliger July 2001](https://reader038.vdocument.in/reader038/viewer/2022103023/56649e0e5503460f94af8ad4/html5/thumbnails/129.jpg)
Have fun using the