The motor effect and left hand rule - presentation .pptx
Demonstration of the motor effect
Predicting the direction of the force
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The Motor Effect
Factors that affect the size of the force
Lesduur is: 60 minOnderdelen in deze les
Demonstration of the motor effect
Predicting the direction of the force
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The Motor Effect
Factors that affect the size of the force
The Motor Effect (HT only)
Combined science - Physics
Key stage 4 - Magnetism
Mr van Hoek
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Equipment
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Demonstration of the motor effect
Visualiser to show the motor effect - jumping wire demo
Reverse magnetic field
Reverse current
Make predictions etc
Increase current with more volts to show effect
The Motor Effect
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N
S
Current perpendicular to the magnetic field, causes a force perpendicular to both.
Image credit : Edgar van Hoek
The Motor Effect
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N
S
Image credit : Edgar van Hoek
The Motor Effect
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N
S
Image credit : Edgar van Hoek
Increasing the force
More current
Longer wire
Stronger field
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Make the wire thicker
Increase the current
Option 3
Option 4
Use an aluminium wire
Increase the wire’s resistance
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Which of the following changes would make the force from the motor effect stronger?
Increase the current
Use a stronger magnet
Option 3
Option 4
Use a larger magnet
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Which of the following changes would not make the motor effect force stronger?
Increase the length of the wire
Increase the length of the wire
Use a stronger magnet
Option 3
Option 4
Increase the current
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Which of the following changes would make the motor force weaker?
Increase the resistance of the wire
The Motor Effect
Magnetic Field + Electric Current → __________________
The wire moves because the interaction between the magnetic field and the electric current produces a __________________
This force always acts parallel / at right angles / diagonally to the magnetic field lines and flow of electric current.
State two ways of increasing the effect you have observed.
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The Motor Effect
Magnetic Field + Electric Current → __________________
The wire moves because the interaction between the magnetic field and the electric current produces a __________________
This force always acts parallel / at right angles / diagonally to the magnetic field lines and flow of electric current.
State two ways of increasing the effect you have observed.
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Motion
force on the wire
Increase the size of the current
Increase the size of the magnetic field
Increase the length of the wire
Fleming’s Left Hand Rule
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force (Motion)
thuMb
magnetic Field
First finger
Current
seCond
Image credit : wikimedia, jfmelero
Which way does the force act?
I Do
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current
Which way does the force act?
I Do
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current into the page
current out of the page
Which way does the force act?
We Do
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N
S
N
current
Force out of the page
Which way does the force act?
We Do
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N
S
N
current
No force - there is no field!
Which way does the force act?
We Do
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S
N
S
N
Which way does the force act?
You Do
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current
Which way does the force act?
You Do
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S
N
S
N
Which way does the force act?
You Do
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S
N
S
N
current
S
N
S
N
current
current
Which way does the force act?
You Do - copy diagrams and work out the force
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current
S
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current
current
Into the page
Into the page
Summary slide - record full screen, use this as script
A current carrying conductor (a wire) in a magnetic field experiences a force if
The direction of the current and the direction of the magnetic field are at right angles.
The force will also be at right angles.
We’ve used the left hand rule to predict the direction. Our thumb pointing up shows the direction of the force, our first finger pointing away from us shows us the direction of the field - N-S. Our second finger pointing across us shows the direction of the current from + to -.
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Don’t forget to complete the Exit Quiz!
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