Electric And Magetic Fields T6 Flashcards
What is static electricity?
When certain insulating materials are rubbed together, negatively charged electrons will be scraped off one and dumped on the other. As the materials are insulators, these electrons are not free to move, this build up of charge is static electricity
What happens when you rub a ballon agains your hair?
Rubbing a ballon against your hair transfers electrons to the balloon leaving it with a negative charge. If you them hold the balloon up to a wall it will stick
What happens as electric charge builds on an object?
The potential difference between the object and the earth increases
Where are electric fields formed?
An electric field is created around any electronically charged object
What happens as you get closer to an object with a magnetic field?
The stronger the field becomes
What happens when a charged object is placed in a magnetic field?
It feels a force, this is caused by the electric fields around the two objects interacting
How many poles do all magnets have?
Two, north and south
What is a magnetic field?
A region where other magnets feel a force
Which way should magnetic field lines travel?
From north to south
What happens with two poles which are the same?
The repel each other
What are the 3 main magnetic elements?
Iron, nickel and cobalt
What are permanent magnets?
Magnets which produce their own magnetic field all the time
What are induced magnets?
Induced magnets only produce a magnetic field when they are in another magnetic field
What happens when a current flows through a long straight conductor?
A magnetic field is created around it
How do you work out force using magnetic flux density?
Force = magnetic flux density x current x length (m)
