1. Combined Science (1-9): Electromagnetism Electromagnetism

2. Objectives:

3. Draw a line under last lesson’s work and write today’s title in your book...
Electromagnetism
14/11/2018
c/w

4. FLASHBACK
FLASHBACK: Explain what is meant by acceleration and how it can be determined experimentally for someone running a race

5. FLASHBACK- AFL
FLASHBACK: Explain what is meant by acceleration and how it can be determined experimentally
Acceleration is the rate of change of speed (change in speed over time)
You could have the runner run around the track taking their speed at two different points
This could be taken by using speed=distance / time
Distance determined by using a tape measure
Time recorded with a stopwatch/clock
Acceleration= v-u/t

6. Draw a radial electric field and a uniform magnetic field
Starter Activity
Draw a radial electric field and a uniform magnetic field

7. Describe what you observe and suggest an explanation
Explore:
Electromagnetism
Task: This diagram shows a wire passing through a piece of paper carrying a current. On the paper are iron filings.
Describe what you observe and suggest an explanation
A current flowing through a wire produces a magnetic field around the wire.
Iron filings can be used to visualise this field as they line up along the field lines.

8. The pattern of field lines (flux) around this wire is circular
Explore:
Electromagnetism
The pattern of field lines (flux) around this wire is circular
You can determine the direction of the field (clockwise/anticlockwise) by making a ‘thumbs up’ with your right hand
When your thumb follows the direction of current, your other fingers show the direction of the field. This is Fleming’s RIGHT hand rule

9. Explore: Solenoids (coils)
If a wire that carries a current is coiled (solenoid) into a spring-shape, the field around the coil ends up looking a little different
Task: Suggest by sketching, what the field will look like around/within a solenoid
Due to the current travelling in different directions on each side of a coil, the two fields partly oppose resulting in a constant field in the centre

10. Explore: Electromagnets
Due this constant field inside the solenoid, you can induce magnetism upon iron by placing some iron in the coil (temporary magnet)
Task: Suggest what could be changed in the set-up shown to make the induced magnet stronger
Task: How could we determine the strength of the magnet experimentally?

11. Explore: Testing Electromagnets
Use the equipment provided to answer the following experimental question:
Q: How does changing the number of coils around the iron affect its strength?

12. 6 mark question!
Explain what a solenoid is and define the difference between a permanent magnet and a temporary magnet

13. 6 mark question! A solenoid is a coil of wire
Explain what a solenoid is and define the difference between a permanent magnet and a temporary magnet
A solenoid is a coil of wire
It generates a magnetic field when current flows through it
The direction of this field can be determined by Fleming’s Right Hand rule
A permanent magnet always produces a magnetic field
This field will attract magnetic materials (poles)
When attached, the field induces a magnetic field in magnetic materials
This turns them into temporary magnets

14. Objectives: