P4.2.3 - Electromagentic Induction Flashcards
How do you produce an induced potential difference across the ends of a wire?
You place the wire in a magnetic field so it cuts them
What happens if the wire does not cut the field lines?
There is no induced potential difference
How do you increase the induced potential difference?
Move the wire faster
Use more wire or loops of wire
Use a stronger magnet
Why does moving the wire faster or using stronger magnets increase the potential difference?
It increases the number of magnetic field lines you are cutting per second
Why does using more loops of wire increase the induced potential difference?
You induce a potential difference in each loop so the total potential difference increases
What happens when current flows in a conductor?
It produces a magnetic field
What is the generator effect?
When a wire cuts magnetic field lines, a potential difference is induced across the ends of the conductor.
How does the generator effect work?
When the wire cuts the magnetic field lines at 90 degrees, the electrons are accelerated to one side of the conductor inducing a potential difference.
What is Lenz’s Law?
The direction of the induced potential difference opposes the charge producing it
Why does Lenz’s law need to be true?
It makes sure the law of conservation of energy is not violated
What is electromagnetic induction?
When a conductor cuts the magnetic field lines of a magnet, a potential difference is induced across the ends of the
conductor
