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Key Experiment Electromagnetic Induction

KEPS31: Investigate principles of electromagnetic induction (including Lenz’s Law) in solid metal rings and coils of wire

Curriculum Topics
Physics: Electromagnetism and induction
Physics: Linear motion and force
Physics: Gravity and motion

Description
Fundamental principles of electromagnetic induction are explored through a variety of focussed investigations. Students use inquiry methods of prediction, testing and reflection to build their conceptual knowledge of Lenz’s Law and its implications. Some of these include electromagnetic braking effects as well as motor and generator applications.

Principle
Faraday’s and Lenz’s Law describes the induction of an electromotive force in a conductor as a result of its intersection with a time varying magnetic field. If the conductor is a closed loop intersecting a magnetic field in such a way that the field threading through the loop is changing then a current known as an ‘Eddy Current’ will form in the loop. The ‘Eddy current’ will have a direction so that its associated magnetic field will oppose the change that is causing it.

Tasks
1. Investigate three different loops and their associated electromagnetic effects.
2. Investigate electromagnetic braking effects.
3. Investigate the induction of currents in coils and compare with the electromagnetic induction in a closed loop.

Ideas for Extended Investigations
1. Investigate electromagnetic braking effects for different coils of wire with variables such as: number turns, turn density, overlay of turns, diameter of coil and length.
2. Investigate principles of operation of devices such as: Electromagnetic Cannon and the “Shaky” torch (additional equipment required).
3. Investigate differences in electromagnetic braking between solid metal rings and coils of wire.

Last edited 22nd Aug 2018


Videos:

70100 Induction Tube The Three Little Rings A basic introduction to the how the induction tube can be used to explore electromagnetic effects


70102 Induction Tube Amusement Park Thrills Have you ever wondered how the brakes work on giant drop amusement park rides?


70103 Who Dropped the Magnet Exploring symmetry of electromagnetic induction by considering relative motion between the magnet and the induction tube


70101 Induction Tube The Three Little Rings Further Explorations Some ideas for further exploration of the rings using the induction tube with measurements using a data logger


70109 Induction Tube The Long and Short of Coils Investigating the electromagnetic effects induced in coils with data logging measurements


70106 Induction Tube Shaky Torch Unveiled An approach to investigating the shaky torch by reverse engineering its components


 

Essential items - The following items are required:
From
SC1090 - Induction Tube - Basic Kit$195.00
EM0090-001 - IEC Air Cored Solenoid 700 Turns$124.00
SC33001 - LED Red with 200mm Cables Pack of 10$6.00
PA1973-066 - IEC Induction Kit Wire to Wind Coils Reel$22.00
PA1973-031 - IEC Induction Kit Coil Bobbin and Front Red$6.30
PA0680-002 - IEC Cable 300mm Blue 2mm Banana to Banana Stackable$5.90
LW1667-01 - Retort Clamp Alloy with Cork Lined Jaws$10.50
SC7323 - Stand Retort Base 250x160mm Rod 700mm$28.00
 
Optional items - The following items are optional:From
LABQ2 - Vernier LabQuest 2 Data Logger and Interface$835.00
LQ-MINI - Vernier LabQuest Mini Data Logger Interface$455.00
LQ-STREAM - Vernier LabQuest Stream Wireless Data Logger$698.00
LP - Vernier Logger Pro 3 Data Logging Software$719.00
VP-BTA - Vernier Voltage Probe$34.00
GDX-VOLT - Vernier Go Direct Voltage Probe$214.00
INA-BTA - Vernier Instrumentation Amplifier$214.00
RMV-BTD - Vernier Rotary Motion Sensor$455.00
GDX-RMS - Vernier Go Direct Rotary Motion Sensor$455.00
DFS-BTA - Vernier Dual-Range Force Sensor$289.00
GDX-FOR - Vernier Go Direct Force and Acceleration Sensor$286.00

Documents:
ExperimentInduction Coil Drop
ExperimentInduction Investigation

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