Electromagnetism Flashcards
What are 3 ways to strengthen an electromagnet?
Increasing current, increasing the number of turns of the coil, adding an iron core.
What happens if two of the same pole are brought near eachother?
They push each other away.
What happens if two opposite poles are brought near eachother?
They pull towards eachother.
What happens when a current flows through a wire?
It generates a magnetic field.
What are 3 advantages of an electromagnet?
The strength can be changed, it can be switched off and it can be reversed.
What happens to an electromagnet when a soft iron core is added?
The electromagnet gets stronger.
What is the name of the coil of wire often used to make electromagnets?
Solenoid.
What effect do motors and loudspeakers use to work?
The motor effect.
In an electrical motor, what will happen if the current direction is reversed?
The force on the wires will be reversed so it will spin the opposite way.
In an electrical motor, what will happen if both the flow of current is reversed and the permanent magnet is reversed?
Reversing two things will cancel eachother out and have no overall effect.
What wouldn’t increase the strength of an electromagnet?
Adding a plastic core.
Which part of a loudspeaker causes the air to vibrate?
The cone is the outside part that vibrates against the air.
Why would a microphone work in a different way as a loudspeaker?
The process is opposite.
