0. Hand Rules Explained 
1. Charge behaviour in an Electric field
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Plasma Ball
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We know that charges experience forces in electric fields. So How do these fields affect the charge whilst it is in motion? 
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Plasma Ball

You will find plasma balls in novelty shops, but how do they work? There is more than what meets the eye, so watch and find out.


Part 2 of my plasma ball videos  where I demonstrate a number of experiments but also explain them

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2. Charge behaviour in an Magnetic field
3. Magnetic Field around a wire
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Electric wires are simply charge carriers. This video looks at the relationship between current and the magnetic field it generates 
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4. Solenoids Explained
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So how does a straight wire with a circular magnetic field get used to make an electromagnet, or a solenoid? This video looks at the physics.

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The following activity is more related to the magnetic field around a wire, or more specifically the magnetic field between two wires.
This Desmos activity allow you to see qualitatively the strength of the field between (and on either side) two wires. The wires are the asymptotes of the graph represents the wires
By sharing the current (which can be reversed by making them negative) you effectively see if there are places that exist where the B field is zero, andwhee they are a minimum
the 'k' value represents µ/2π though( its value isn't that large) and can be left alone. Changing it does not change the trend of the graph
The derivative is shown to show that a minimum can exist ate certain points
This Desmos activity allow you to see qualitatively the strength of the field between (and on either side) two wires. The wires are the asymptotes of the graph represents the wires
By sharing the current (which can be reversed by making them negative) you effectively see if there are places that exist where the B field is zero, andwhee they are a minimum
the 'k' value represents µ/2π though( its value isn't that large) and can be left alone. Changing it does not change the trend of the graph
The derivative is shown to show that a minimum can exist ate certain points
4. Examining the motor effect
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Since a current bearing wire has a magnetic field, placing the same wire in an external magnetic field will mean it will experience a force. This is known as the motor effect. See Resources for using a current balance which examine the motor effect 
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A current balance is a tool used in school to examine the motor effect. Its basically a swing which experiences a force upward on one side due to the motor effect, and a weigh on the other which counter balances it

5. The force between two wires
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The motor effect between two parallel current bearing wires 
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There are a number of ways we can explore this concepts further.
One aspect of most high school physics course on kinematics, is that they only concern themselves with constant acceleration. In reality however, acceleration, like displacement and velocity, can chance with respect to time.
Velocity is the rate of change of displacement. Unit: m/s^{2}
Acceleration is the rate of change of velocity.
So what is the rate of change of acceleration?
The answer to that is the jerk. So slope of the acceleration vs time graph is the jerk. Unit: m/s^{3}
We can go further. What is the rate of change of the jerk?
Well it's the snap. Unit: m/s^{4}
Can we go further? Yep. The rate of change of snap is the crackle. Unit: m/s^{5}
I think you can guess the next one.
We can go further. What is the rate of change of the jerk?
Well it's the snap. Unit: m/s^{4}
Can we go further? Yep. The rate of change of snap is the crackle. Unit: m/s^{5}
I think you can guess the next one.
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 pHET graphing animation  this interactive from the University of Colorado pHet team is a great way to demonstrate the relationship between motion and its graphical analysis. That why I used it in my video. At this time its Java based so will only work on PC/Mac
6. Two applications
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Here are two applications that rely on the motor effect to work 
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7. How a DC motor works
8. How well do you know charge behaviour in fields?
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Test your understanding of charges in fields. So do the Quiz and try to get full marks
Then check your understanding if necessary with the video 

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9. How well do you know the motor effect?
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quiz
Test your understanding of motor effect. So do the Quiz and try to get full marks Then check your understanding if necessary with the video 

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