Electromagnetism Flashcards
If there is a electrical current in a conductor, what does it produce?
A magnetic field around it
If there is a larger eletric currentt, what does it do to the magnetic field?
Magnetic field becomes stronger
How do I determine the direction of the magnetic field?
Direction of magnetic field depends on directoon of current
Is there a magnetic field around a straight, current carrying wire?
Yes
What is the magnettic field around a straight current carrying wire made up of?
Concentric circles with the wire in the centre
What is the magnetic field in the centre of a flat circular coil of wire simlar to?
Similar magnetic field to a bar magnet
Describe the magnetic field of a flat circular coil of wire
There are concentric ellipses (stretched circles) of magnetic field lines around the coil
What is the magnetic field like inside of a current-carrying solenoid?
It is strong and uniform
What is the magnetic field like outside of a current carrying solenoid?
It is like that of a bar magnet
What do the ends of a solenoid corelate to with bar magnets?
North and South pole
What is a current carrying solenoid
A Electromagnet
What does it mean if a magnetic material is considered soft?
It loses its induced magnetism quickly
What does it mean if a magnetic material is considered hard?
It keeps it’s induced magnetism permanently
Give an example of a soft and hard magnetic material
Soft: Iron
Hard: Steel
What is a use for a soft material like iron?
Iron is used in transformers as it has to magnetise and demagnetise 50 times per second
How can you increase the strenth of the magnetic field around a solenoid?
By adding a magnetically soft iron core through the middle of the coil
