Difference between revisions of "Apps-On-Physics/C3/Magnetism-and-Electromagnetism/English"

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{|border=1
 
{|border=1
 
|-
 
|-
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|| Visual cue
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|| '''Visual Cue'''
−
|| Narration
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|| '''Narration'''
 
|-
 
|-
 
|| '''Slide Number 1'''
 
|| '''Slide Number 1'''
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|-
 
|-
 
|| Point to the file in the downloads folder
 
|| Point to the file in the downloads folder
−
|| I have already downloaded '''Apps on physics''' to my '''Downloads''' folder.
+
|| I have already downloaded '''Apps on Physics''' to my '''Downloads''' folder.
  
 
|-
 
|-
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|-
 
|-
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|| Click on '''Turn magnet''' buttons.
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|| Click on '''Turn magnet''' button.
 
|| Click on '''Turn magnet '''button.
 
|| Click on '''Turn magnet '''button.
  
−
Observe that both bar magent and magnetic needle change their direction.
+
Observe that both bar magnet and magnetic needle change their direction.
  
 
|-
 
|-
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Place the cursor on the magnetic needle.
 
Place the cursor on the magnetic needle.
  
−
Click on the magnetic needle and move the needle up to draw the magnetic lines.
+
Click on the magnetic needle and move the needle up and down to draw the magnetic lines.
  
 
Continue to draw the lines as shown here.
 
Continue to draw the lines as shown here.
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|| Right click on '''magneticfieldwire_en.htm''' file.
 
|| Right click on '''magneticfieldwire_en.htm''' file.
  
−
Select '''Open with Firefox web browser''' option.
+
Select '''Open with Firefox Web browser''' option.
  
 
|-
 
|-
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|-
 
|-
 
|| Point to minus and plus signs
 
|| Point to minus and plus signs
−
|| The signs at the ends of the wire symbolize the terminals of the connected battery.
+
|| The signs at the end of the wire symbolizes the terminals of the connected battery.
 
|-
 
|-
 
|| Point to concentric circles.
 
|| Point to concentric circles.
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|-
 
|-
−
||  
+
|| Cursor on the interface.
 
|| Let us find the direction of magnetic field using right hand thumb rule.
 
|| Let us find the direction of magnetic field using right hand thumb rule.
 +
 +
|-
 +
||Cursor on the interface.
 +
||Observe the picture and put your right hand as follows.
  
 
|-
 
|-
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|| At the bottom, there are three check-boxes.
 
|| At the bottom, there are three check-boxes.
  
−
These are''' Current direction, Magnetic field, Lorentz force.'''
+
These are '''Current direction''', '''Magnetic field''' and '''Lorentz force'''.
  
 
|-
 
|-
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|-
 
|-
 
|| Press '''F5''' key on the keyboard.
 
|| Press '''F5''' key on the keyboard.
−
|| Press''' F5''' key on the keyboard to refresh the '''App'''.
+
|| Press''' F5''' key on the keyboard to restart the '''App'''.
  
 
|-
 
|-
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|-
 
|-
−
|| Now try to keep your fingers of left hand as  
+
||Try to keep your fingers of left hand as  
  
 
index finger in the direction of magnetic field and  
 
index finger in the direction of magnetic field and  
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|-
 
|-
−
||  
+
|| Point to force.
 
|| Here the direction of Force is towards the right-side.
 
|| Here the direction of Force is towards the right-side.
  
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|-
 
|-
−
||  
+
|| Cursor on the '''generator App'''.
 
|| Now let us open the '''Generator App'''.
 
|| Now let us open the '''Generator App'''.
  
 
|-
 
|-
−
|| Open the App ,following the same procedure.(show the procedure)
+
|| Open the '''App''', following the same procedure.
 
|| I will open the '''App '''as before.
 
|| I will open the '''App '''as before.
  
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Point to show the peaks.
 
Point to show the peaks.
−
|| Increase the rotation to 12 rotation per minute.
+
|| Increase the rotation to 12 rotations per minute.
  
 
In the graph we can see two complete cycles in one minute.
 
In the graph we can see two complete cycles in one minute.
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|-
 
|-
−
|| Point to the wooden circular ring.
+
|| Point to the rectangular coil.
 
|| Here rotation of the rectangular coil is a source of mechanical energy.
 
|| Here rotation of the rectangular coil is a source of mechanical energy.
  
 
|-
 
|-
 
|| Point to the red arrow.
 
|| Point to the red arrow.
−
|| Due to the rotation of the coil, curent is induced into the wire.
+
|| Due to the rotation of the coil, current is induced into the wire.
  
 
The red arrow represents the direction of the induced current.
 
The red arrow represents the direction of the induced current.
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This device ensures that the current flows only in direct current mode.
 
This device ensures that the current flows only in direct current mode.
  
−
Hence With Commutator means, the generator is a DC generator.
+
Hence '''With Commutator''' means, the generator is a '''DC''' generator.
  
 
|-
 
|-
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|-
 
|-
−
|| In the graph point to show the moving blue point.(show one more pointer on the voltage source during editing)
+
|| In the graph point to show the moving blue point.
 
|| In the graph, moving blue point indicates the change in voltage.
 
|| In the graph, moving blue point indicates the change in voltage.
  
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|-
 
|-
 
|| Cursor on the interface.
 
|| Cursor on the interface.
−
|| We can find the direction of induced currect using Fleming’s right-hand rule.
+
|| We can find the direction of induced current using Fleming’s right-hand rule.
  
 
|-
 
|-
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|-
 
|-
 
|| Click on '''Pause '''button when the .
 
|| Click on '''Pause '''button when the .
−
|| Click on '''Pause''' button.
+
|| Click on the '''Pause''' button.
  
 
|-
 
|-
−
|| Show the picture of Fleming’s right hand rule.(''The fingers of right hand means the same as flemings left hand'')
+
|| Show the picture of Fleming’s right hand rule.
 
|| Now arrange fingers of your right hand as shown in the figure.
 
|| Now arrange fingers of your right hand as shown in the figure.
 +
 +
|-
 +
||Cursor on the interface.
 +
||We can determine the direction of magnetic field using Fleming's right hand rule.
  
 
|-
 
|-
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'''Direction of movement,'''
 
'''Direction of movement,'''
  
−
'''Magnetic field, '''and  
+
'''Magnetic field '''and  
  
 
'''Induced current'''.
 
'''Induced current'''.
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|-
 
|-
 
|| Press F5 key on the keyboard.
 
|| Press F5 key on the keyboard.
−
|| Press '''F5''' key on the keybord to restart the '''App'''.
+
|| Press '''F5''' key on the keyboard to restart the '''App'''.
  
 
|-
 
|-
 
|| Point to the graph.
 
|| Point to the graph.
−
|| AC generator is an alternating current generator.
+
|| '''AC''' generator is an alternating current generator.
  
 
So, here the graph shows positive as well as negative voltages.
 
So, here the graph shows positive as well as negative voltages.
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'''Assignment'''
 
'''Assignment'''
−
 
−
Change the rotation per minute to 10.
 
  
 
|| As an assignment,
 
|| As an assignment,
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Note the changes in the movement of the coil and graph.
 
Note the changes in the movement of the coil and graph.
 +
 
Explain the reason for the changes.
 
Explain the reason for the changes.
  
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'''Spoken Tutorial workshops.'''
 
'''Spoken Tutorial workshops.'''
−
|| The '''Spoken Tutorial Project '''team,
+
|| The '''Spoken Tutorial Project '''team,
  
 
conducts workshops and gives certificates.
 
conducts workshops and gives certificates.

Latest revision as of 12:16, 17 July 2020

Visual Cue Narration
Slide Number 1

Title slide

Welcome to the Spoken Tutorial on Magnetism and Electromagnetism.
Slide Number 2

Learning objective

At the end of this tutorial you will be able to,
  • Draw magnetic field lines for a bar magnet.
  • Verify right hand thumb rule.
  • Verify Fleming's left hand and right hand rules.
  • Simulate the working of a generator.
Slide Number 3

System Requirements

Here I am using,

Ubuntu Linux OS version 16.04

Firefox web browser version 62.0.3

Slide Number 4

Pre-requities

To follow this tutorial, learner should be familiar with Apps on Physics.

For the pre-requisites tutorials please visit this site.

https://spoken-tutorial.org/

Slide Number 5

Apps on Physics

In this tutorial we will use,

Magnetic Field of a Bar Magnet

Magnetic Field of a Straight Current-Carrying Wire

Lorentz Force and

Generator Apps.

Point to the file in the downloads folder I have already downloaded Apps on Physics to my Downloads folder.
Right click on

magneticfieldbar_en.htm file.

Select option open with Firefox web Browser option.

Right click on magneticfieldbar_en.htm file.

Select Open With Firefox web Browser option.

Magnetic field bar App opens.

Point to the bar magnet.

Point to the needle.

The App opens showing a magnet and a magnetic needle.
Point to Clear field lines and Turn magnet. On the green panel there are two buttons.

Clear field lines and Turn magnet.

Move the cursor on Red color of Bar magnet and green color. Poles of a bar magnet and compass needle are represented by the following colors.

Red for north pole and green for south pole.


Click on Turn magnet button. Click on Turn magnet button.

Observe that both bar magnet and magnetic needle change their direction.

Place the cursor on the magnetic needle.

Move the magnetic needle with the pressed mouse.

Let us draw the magnetic field lines.

Place the cursor on the magnetic needle.

Click on the magnetic needle and move the needle up and down to draw the magnetic lines.

Continue to draw the lines as shown here.

Click on the Clear field lines button. Click on the Clear field lines button.
Click on Turn magnet button. Click on Turn magnet button.
Use the pressed mouse to draw the lines. Again draw the magnetic lines around the magnet.
Point to the changed direction on the lines. When we turn the magnet, the lines of force change the direction.
Point to the direction of arrows The direction of magnetic field outside the bar magnet is from north to south.

It is shown by the arrows.

Point to the maximum lines of fields.

Ask question on the interface.

Inside it from south to north.

Magnetic field is strongest inside the bar magnet.

Outside the bar magnet it is strongest near the poles.

What is the direction of magnetic field inside the bar magnet?

Point to Magnetic Fieldof a Straight Current-Carrying Wire Next we will move on to Magnetic Field Line in a Current Carrying Wire App.
Right click on magneticfieldwire_en.htm file.

Select Open with Firefox web browser option.

Right click on magneticfieldwire_en.htm file.

Select Open with Firefox Web browser option.

Cursor on the Setup. The App opens showing magnetic field lines around a current carrying wire.
Point to Reverse current buttons. On the right side of the screen we have a Reverse current button.
Point to the red arrow The red arrow indicates the direction of the current.

Note that the direction of current is opposite to that of electrons.

Point to minus and plus signs The signs at the end of the wire symbolizes the terminals of the connected battery.
Point to concentric circles. The concentric circles are the magnetic field around the current carrying wire.
Cursor on the interface. Let us find the direction of magnetic field using right hand thumb rule.
Cursor on the interface. Observe the picture and put your right hand as follows.
Use your right hand thumb to point the position of direction of the current. Put your right hand thumb in the direction of the current.
Curl the fingers inside to palm. Now curl your fingers inside.

Fingers gives you the direction of magnetic field.

Slide Number 6

Assignment

As an assignment,

Reverse the current flow and determine the magnetic field.

Right click on lorentzforce_en.htm file.

Select Open with Firefox web Browser option.

Let us move on to the next App, Lorentz Force.

Follow the same steps as we used for previous App to open htm file.

Point to the Setup. Interface shows a horseshoe magnet through which a conducting wire is passed.
Point to the Blue coloured arrows. The blue arrows shows the direction of the magnetic field.
Point to each button.

On/Off

Reverse current

Turn magnet

On the green panel we have the following buttons.

On/Off

Reverse current

Turn magnet.

Point to the wire. When the circuit is open, the wire is shown in black colour.
Click on the On/Off button. Click on the On/Off button to complete the circuit.
Point to the red wire and show the switch is on. Notice that the wire is in conduction mode.

This is indicated by the red coloured wire.

Point to the each check-box

Current direction

Magnetic field

Lorentz force.

At the bottom, there are three check-boxes.

These are Current direction, Magnetic field and Lorentz force.

Point to the black arrow. The black arrow pointing towards right is the Lorentz force.
Show with the cursor the perpendicular state of Lorentz force. Lorentz force is always perpendicular to the magnetic field.
Click on Turn magnet button. To change the direction of magnetic field,

click on the Turn magnet button.

Cursor on the interface. Let us verify the direction of Lorentz force using Fleming’s left-hand rule.
Press F5 key on the keyboard. Press F5 key on the keyboard to restart the App.
Uncheck Lorentz force check-box. First uncheck the Lorentz force check-box.
Click on On/Off button. Click on On/Off button.
Use left hand fingers to find the force. Now keep your fingers of the left hand as suggested here.
Try to keep your fingers of left hand as

index finger in the direction of magnetic field and

middle finger in the direction of current and

thumb points in the direction of Force.

Index finger pointing in the direction of magnetic field.

Middle finger pointing in the direction of current.

Thumb shows the direction of Lorentz force.

Point to force. Here the direction of Force is towards the right-side.

This rule is Fleming’s left-hand rule.

Check the Lorentz force check-box. Let us verify our answer by checking the Lorentz force check-box.

Observe that the direction is same as shown in the App.

Slide Number 7

Assignment

Reverse the current flow.

Determine the direction of lorentz force using Fleming’s left hand rule.

As an assignment

Reverse the current flow.

Determine the direction of lorentz force using Fleming’s left hand rule.

Cursor on the generator App. Now let us open the Generator App.
Open the App, following the same procedure. I will open the App as before.
Cursor in the interface. The App shows a generator.
Point to the generator. An electrical generator converts mechanical energy into electrical energy.
Point to the magnet and rectangular loop inside the magnet. The App opens showing a horseshoe magnet.

A rectangular current carrying coil is inserted between the poles of the magnet.

Drag the slider and show the changes.

Point to the rotating coil.

Point to the value of 6 rot/min.

On the green panel, we can change the rotations per minute using the slider.

By default the rectangular coil rotates 6 rotations per minute.

We can change the rotation of the coil to a maximum of 12 rotations per minute.

Drag to 12 rotations per minute.

Cursor on the graph.

Point to show the peaks.

Increase the rotation to 12 rotations per minute.

In the graph we can see two complete cycles in one minute.

Here the frequency of the maximum output voltage is doubled.

Point to the path of red coloured wire from rectangular coil to voltage source. The rectangular coil is connected to the voltage source through the slip rings.
Point to rectangular coil and the blue magnetic field lines. Observe that the rectangular coil is rotating about an axis.

This coil is perpendicular to the magnetic field.

Point to the rectangular coil. Here rotation of the rectangular coil is a source of mechanical energy.
Point to the red arrow. Due to the rotation of the coil, current is induced into the wire.

The red arrow represents the direction of the induced current.

Point to the commutators. In the green panel we can choose an AC generator or DC generator.
Point to Without commutator radio button.

Click on With commutator radio button.

By default Without commutator an AC generator is selected.

Select With commutator radio button.

Commutator is a device for reversing the direction of flow of current.

This device ensures that the current flows only in direct current mode.

Hence With Commutator means, the generator is a DC generator.

Point to the graph of voltage v/s time. On the top of the circuit, voltage v/s time graph is plotted.

This is the graph of a DC generator.

In the graph point to show the moving blue point. In the graph, moving blue point indicates the change in voltage.
Click the Change direction button and show the change in direction of rectangular coil. Change direction button changes the direction of the rectangular coil.

Click on the Change direction button.

Observe the change in the direction of rectangular coil.

Also notice the change in the graph.

Press F5 key on the keyboard. Press F5 key on the keyboard to restart the App.
Cursor on the interface. We can find the direction of induced current using Fleming’s right-hand rule.
Show the picture of Fleming’s left-hand rule here. This rule is same as Fleming’s left-hand rule.
Click on Pause button when the . Click on the Pause button.
Show the picture of Fleming’s right hand rule. Now arrange fingers of your right hand as shown in the figure.
Cursor on the interface. We can determine the direction of magnetic field using Fleming's right hand rule.
Point to the check-box

Direction of movement,

Magnetic field,

Induced current.

There are three check-boxes at the bottom of the green panel.

Direction of movement,

Magnetic field and

Induced current.

Uncheck Magnetic field check-box. Uncheck the Magnetic field check-box.

Notice that the magnetic field lines disappear.

Uncheck Direction of movement check-box. In the similar way we can uncheck the remaining check-boxes if not required.
Press F5 key on the keyboard. Press F5 key on the keyboard to restart the App.
Point to the graph. AC generator is an alternating current generator.

So, here the graph shows positive as well as negative voltages.

Slide Number 8

Assignment

As an assignment,

Change the rotations per minute to 0, 3.0, 6.0 and 9.0

Note the changes in the movement of the coil and graph.

Explain the reason for the changes.

Let us summarise
Slide Number 9

Summary

Using these Apps we have,

Drawn magnetic field lines of a bar magnet.

Verified right hand thumb rule.

Verified Fleming's left hand and right hand rules.

Simulated the working of a generator.

Slide Number 10

Acknowledgement

These Apps were created by Walter Fendt and his team.
Slide Number 11

About Spoken Tutorial project.

The video at the following link summarises the Spoken Tutorial project.

Please download and watch it.

Slide Number 12

Spoken Tutorial workshops.

The Spoken Tutorial Project team,

conducts workshops and gives certificates.

For more details, please write to us.

Slide Number 13

Forum for specific questions:

Do you have questions in THIS Spoken Tutorial?

Please visit this site

Choose the minute and second where you have the question. Explain your question briefly

Someone from our team will answer them

Please post your timed queries in this forum.
Slide Number 14

Acknowledgement

The Spoken Tutorial Project is funded by MHRD, Government of India.
This is Himanshi Karwanje from IIT-Bombay.

Thank you for joining.

Contributors and Content Editors

Karwanjehimanshi95, Madhurig, Snehalathak

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