Pearson Edexcel IGCSE Physics Summary Notes Magnetism and Electromagnetism
15 views 0 purchase
Course
Physics
Institution
GCSE
Book
Pearson Edexcel International GCSE (9-1) Physics Student Book
Pearson Edexcel IGCSE Physics Summary Notes Magnetism and Electromagnetism
Concise, detailed, easy-to-revise
Contains the complete chapter on Magnetism and Electromagnetism
Physics IGCSE(9-1) Edexcel, Question and Answer Notes
IGCSE physics - TOPIC 2: ELECTRICITY
IGCSE physics - TOPIC 5: SOLIDS, LIQUIDS, & GASES
All for this textbook (15)
Written for
GCSE
GCSE
Physics
1
All documents for this subject (345)
Seller
Follow
rdas07
Content preview
Magnetism
Magnets
- Strongest at poles (north and south). Similar poles repel, opposite poles attract.
- Permanent magnets (like bar magnets) are made from magnetically hard materials (steel).
Magnetically hard materials keep magnetism after being magnetised.
- Iron is magnetically soft and loses its magnetism easily (temporary magnet).
Magnetic fields
Area around every magnet where we can detect magnetism. Normally they cannot be seen but iron
filings or plotting compasses can be used to show shape, strength and direction:
1) Place bar magnet between two books, place paper over it
2) Sprinkle iron filings on paper above magnet
3) Tap paper gently
4) Iron filings will reveal magnetic field pattern
OR
1) Place bar magnet on piece of paper
2) Place many small compasses on paper near magnet
3) Look at pattern shown by needles of compasses
Magnetic field lines used to display magnetic fields. They show:
- Shape
- Direction- field lines go from N to S
- Strength- distance between lines indicates strength
Overlapping magnetic fields
Creating a uniform magnetic field
Evenly spaced parallel lines. Same strength and direction everywhere.
, Place two permanent bar magnets the correct distance apart (close together) with opposite poles
facing each other (i.e. North facing South)
Induced magnetism
When an object made from a magnetic material (iron nail) enters a magnetic field, it becomes an
induced (temporary) magnet. When the nail leaves the field, it will be demagnetised. If the nail was
made from steel (magnetically hard), it may retain some of its magnetism.
Electromagnetism
When there is current in a wire, a magnetic field is created around it. The field is weak and circular
around the wire
If the wire is made into a coil or solenoid (long coil):
Increase strength of electromagnet by:
1) Increasing current in the wire
2) Wrapping the wire into a coil or solenoid
3) Adding a soft iron core
Shape of magnetic field around a solenoid is the same as a bar magnet.
Direction of thumb shows polarity- it is N
Increase the strength of the solenoid by:
1) Increasing current in solenoid
2) Increasing no. of turns in solenoid
3) Adding (soft) iron core
Uses of electromagnetism
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller rdas07. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.45. You're not tied to anything after your purchase.
