Module 6 - 6.3.1 Magnetic Fields Flashcards
A Magnetic Field is
a region around a permanent magnet/a moving charge in which another body with magnetic properties feels a force
Magnetic Flux Lines show the
Shape and Direction of a Field
Flux Lines Point
North –> South
The closer the flux lines
the stronger the magnetic field
Magnetic Elements (3)
Cobalt, Iron, Nickel
Magnetic Flux Density (definition) (+ measured in)
F/IL where
- F = force acting on a wire
- I = current at 90 degrees to the magnetic field
- L = length of wire
measured in Teslas (T)
Use the Right Hand Grip Rule to …
determine the direction of the field around a current carrying wire
Shaping a wire into a coil
increases the strength of the magnetic field as the concentric flux lines around the wire add together
A solenoid is a
Long coil of current carrying wire
If the direction of the current is reversed
The direction of the field also reverses
Inside a solenoid the field is
strongest and very uniform
Outside a solenoid the field is
similar to that of a bar magnet
If an iron core is placed inside a solenoid
the magnetic field increases considerably
The Motor Effect
When the magnetic fields from a wire and a magnet interact the resultant field causes an upward force acting on the wire
The wire will experience the greatest force when it is
perpendicular to the magnetic field lines
