P6 IGCSE Physics Student Objectives.doc Download this file
Wednesday, 14 December 2011
6.7
6.7 starter
01 December 2011
19:37
Tell the person next to you…
1. If the field lines are close together, what does this tell you about the field?
2. If the field lines are widely spaced, what does this tell you about the field?
3. If the magnetic field lines are parallel to each other, what does this tell you about the field?
Answers
1. The field is strong
2. The field is weak
3. The field is of a constant strength - a "uniform" field
6.7
28 November 2011
15:08
· 6.7 know how to use two permanent magnets to produce a uniform magnetic field pattern
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· When the field lines are parallel, the field will be uniform (constant field strength)
6.6
6.6
28 November 2011
15:07
· 6.6 sketch and recognise the magnetic field pattern for a permanent bar magnet and that between two bar magnets
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6.4
6.4
28 November 2011
15:07
• 6.4 understand the term ‘magnetic field line’
Observing the magnetic field around a bar magnet and a wire
magnetic field around a bar magnet and wirehttp://www.youtube.com/watch?v=pjJSa148CKI
· Use iron filings to observe the magnetic field around a bar magnet
· Use plotting compasses to observe the field
· Use the 3D field demonstrator to observe field
6.4 Field around bar magnet simulation
28 November 2011
15:06
Website:
http://www.walter-fendt.de/ph14e/mfbar.htm
Example:
http://maddog11physics.posterous.com/bar-magnet
6.4 plenary questions and Earth's Magnetic Field
01 December 2011
19:12
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6.4 plenary 2
01 December 2011
19:14
· Can you stop a magnetic field?
· Watch the incredible flying paperclip demo to find out!
· Now you can try with your hand...
6.5 and 6.3
6.5 starter
01 December 2011
18:42
Demo
· How I turned a needle into a compass to find my way out of the jungle...
6.5 and 6.3
28 November 2011
15:07
· 6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field
· 6.3 recall the properties of magnetically hard and soft materials
Practical
1. Stroke a magnet along a steel bar and an iron bar
2. Try picking up some bar clips
3. Bang both bars on the desk
4. Now try picking up the paperclips again
5. Repeat the experiment but this time put the bars inside an electromagnet instead of stroking them
Explanation
· Steel is a magnetically hard material. It retains its magnetism when magnetised
· Iron is a magnetically soft material. It can be magnetised, but easily loses its magnetism
6.2
6.2 Starter 
28 November 2011
14:52
Neodymium magnets are strong…
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6.2 starter 2
01 December 2011
18:23
· Magnetic materials are attracted by magnets.
· Can you list the 5 magnetic materials?
(3 elements, 2 compounds)
Answer
3 elements
1. Fe (iron)
2. Co (cobalt)
3. Ni (nickel)
2 compounds
1. Steel (an alloy of iron)
2. Fe3O4 (magnetite (lodestone), one of the oxides of iron)
And the exceptions that prove the rule… ?
· Magnet moves water - diamagnetism
· Levitating frog...
· Ferrofluids…
(Picture on page "6.4 6.5 6.6 6")
6.2
01 December 2011
18:21
· 6.2 recall that magnets repel and attract other magnets, and attract magnetic substances
Question
You have 3 bars that all look the exactly the same but they are made from:
1. a magnet
2. steel
3. aluminium
You are given a horseshoe magnet. How can you use this to tell which bar is which?
Answer
1. The bar magnet will be attracted to one pole of the horseshoe magnet and repelled by the other
2. The steel bar will be attracted to both poles of the horseshoe magnet
3. The aluminium bar will be attracted to neither pole of the horseshoe magnet
6.2 Plenary - Multichoice questions
01 December 2011
18:12
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