Where is the magnetic forces strongest?
Poles
What is a permanent magnet?
Produces its own magnetic field 🧲
What is an induced magnet?
-Becomes a magnet when placed in a magnetic field
-Experiences force of attraction
-Looses all magnetism when removed from magnetic field
Define magnetic field?
Region round magnet where a force acts on another magnet
How a magnetic field be plotted?
Using a compass 🧭
What does a compass tell us about the earth?
Core is magnetic, produces a magnetic field
What happens when a current flower through a conducting wire?
Magnetic field produced around wire
How can magnetic field be strengthened?
Coiling a wire into a solenoid (helix)
How can magnetic field strength of a solenoid be increased?
Adding an iron core
What is an electromagnet?
Solenoid with iron core
What happens when a conductor is placed in a magnetic field?
Conductor and field exert an equal and opposite force on each other
What is the motor effect due to?
Interactions between magnetic fields
How can the direction of force of a conductor be found?
Using Fleming’s Left Hand Rule
Fleming’s left hand rule what does the first finger represent 👉?
F = field
Fleming’s left hand rule what does the second finger represent 👇?
seCond = current
Fleming’s left hand rule what does the thumb represent?
thuMb = movement
What does the size of the conductor depend on?
-Magnetic flux density (strength of magnetic field)
-Current in conductor
-Length of conductor in magnetic field
How does the basis of an electric motor work?
Coil of wire carrying a current in a magnetic field experiences a force, causing it to rotate
