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OUTCOME
By the end of the lesson you will recognise the contribution of Faraday and Lenz to our understanding of EM induction. you will be able to apply the idea of magnetic flux to problems qualitatively and quantitatively.
Magnetic flux is the measure of a magnetic field over an area and is calculated by
Φ = B x A, where B and A are perpendicular.
A current is induced when there is: changing magnetic flux (do this by altering B or A).
LEARNING TASKS
Explain
1. What factors will increase the amount of flux through a loop?
2. What factors would effect the size of the induced current in a loop?
3. What would happen if a loop was placed in a field at 45o
Explore and Elaborate
Prac: Electromagnetic Induction
Look at the first two experiments...
Q - what situations resulted in a current
Q - can you explain the reversal of the current?
Prac: Bouncing magnets
Evaluate
Exercise 4.4
p.140 (Jac)
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