C - Magnetism Flashcards
Magnetic flux lines:
Cannot be insulated.
Like magnetic poles:
Repel.
A permeable material means that:
Flux lines concentrate in it.
The following listed material with lowest permeability is: Aluminium, steel, nickel, or cobalt.
Aluminium.
Three characteristics of the direction of magnetic flux lines are:
Have direction from North to South pole, take the shortest path, and repel one another when they have the same direction.
A permanent magnet loses magnetic strength when:
Exposed to shock.
The three factors that affect the strength of an electromagnet are:
Number of turns of wire within the coil, voltage applied to the coil, and type of core material.
An electromagnetic device that draws an iron core to its centre is called a:
Solenoid.
The right-handed rule for conductors determines the:
Direction of the magnetic flux lines around the conductor.
When using the right-handed rule for coils, the:
Thumb points to the North Pole.
The magnetic principle used in electric motor operation is called … and states that …?
Motor principle and states that current carrying conductor within a magnetic field will move to an area of the weaker magnetic field.
Voltage is generated in a conductor when a magnetic field:
Moves at an angle around a conductor.
The four factors that determine the amount of voltage produced in a conductor are:
The speed at which the magnetic lines of force are cut, the angle of intersection between the magnetic field and the conductor, the magnetic field’s strength, and the number of conductors moving through the magnetic field.
When current flowing in a coil of wire is stopped:
The surrounding magnetic field collapses.
Self-induction can be stated as:
The process of producing voltage in a coil as the magnetic field collapses when current flow stops results in self-induction.
