Magnectic Fields Flashcards
What tells you how strong a magnet is?
The distance between the magnetic field lines
What direction do the magnetic field lines travel around a magnet bar?
From north to south around the magnet
Look in book for diagram
How does the right hand grip rule work?
The thumb Indicates current and the direction of fingers indicates direction of the current
How does the right hand grip rule apply for a solenoid?
Fingers indicate the direction of current flow and your thumb will always point to the North Pole.
Look in Book for diagrams to explain when the coil is going over the wire or behind it.
Why must the wire used be insulated?
To prevent any short circuits
How can the strength of a magnetic field be increased?
- By using a larger current
- By increasing the number of coils around the solenoid
What effect does replacing the iron core of a solenoid with a wooden one?
It would weaken the magnetic field as it doesn’t have free electrons to carry a charge
What do magnetic field lines look at between two magnets?
Look in book
Straight lines from North to south equal spaces apart
Explain Fleming’s left hand rule?
Look in book
The thumb shows the direction of the force
The first finger shows the direction of the magnetic field
The second finger shows the direction of conventional current
What happens with Flemings left hand rule if the magnetic fields and current are parallel?
No force acts in any direction
What would happen to the direction of force on a wire if an alternating current is used?
The direction of current alternates clockwise and anticlockwise which would change the direction of the force back and forth.
