Electric and Magnetic Fields Flashcards
(24 cards)
Why is a soft iron cores to solenoids?
increase the strength
Is iron magnetically soft or hard?
softly
How do you make and induced magnetic?
Place a magnetic material into a magnetic field
What is a solenoid?
a coil of wire with a strong uniform magnetic field
Which 4 metals are magnetic?
Nickel
Cobalt
Iron
Steel
How could you increase the strength of the magnetic?
Increase the current
How can a compass visualise field lines
the need always points along a field line towards the south pole
What is an electromagnet
is a solenoid with an iron core inside
What is the national grid?
the network of transformers, pylons and wires
What does a step up transformer do?
used to increase the voltage and decrease the current electricity
How can you change the direction of magnetic fields?
Change the direction of the current
Will a step down transformer have more turns on from the primary or secondary coil?
the primary coil
Which direction do magnetic field lines point?
From the north pole to the south pole
What do we call 2 poles of a magnet?
North and South
What is a magnetic material?
any material that can be influenced by a magnetic field and had the potential to be a magnetic
What does a step-down transformer do?
used to decrease the voltage and increase currents
How can field lines show you the strength of a magnetic field?
The denser the field lines the stronger the magnetic field will be
What time of day is electricity demand usually highest?
Late in the afternoon and early evening
What are magnetic field lines?
arrows that show the magnetic field around an object
What is electromagnetism?
an electrical current flows through a wire and a magnetic field is produced
What is a permanent magnet?
produce their own magnetic field
What is an induced magnet?
produce a magnetic pic field in the presence of another magnet
Give 4 ways to increase the strength of solenoid
Increase the current
Increase number of turns
Reduce length
Add a soft iron core
What is a magnet?
any material or object that produces a magnetic field
