🧲 Magnetism & Magnetic Fields Flashcards
(10 cards)
What materials are magnetic?
Iron, steel, cobalt, and nickel.
What is the shape of the magnetic field around a bar magnet?
Field lines go from north to south, forming curved lines around the magnet.
How can you increase the strength of an electromagnet?
Increase current, add more turns to the coil, or add an iron core.
What is the motor effect?
A wire carrying current in a magnetic field experiences a force.
What is Fleming’s Left-Hand Rule used for?
Predicting the direction of the force in the motor effect.
What happens in a loudspeaker?
A coil in a magnetic field vibrates with the current, producing sound waves.
What is electromagnetic induction?
Creating a voltage by moving a conductor through a magnetic field.
What does a transformer do?
Changes the voltage of alternating current using electromagnetic induction.
Why do transformers only work with AC?
Because changing current is needed to produce a changing magnetic field.
How does a microphone work?
Sound waves move a diaphragm, which moves a coil in a magnetic field, inducing a current.
