The motor effect Flashcards
What is produced when current flows through a conducting wire
A magnetic field is produced around the wire
What determines the strength of the magnetic field around a current carrying wire
The magnitude of the current flowing through the wire
The distance from the wire
What is a solenoid
A coil of wire which when current passes through creates a strong magnetic field
Describe the magnetic field found inside a solenoid
Strong and uniform
What is an electromagnet
A solenoid with an added iron core
Adding the iron core increases the strength of the magnetic field
What is the motor effect
When a force is exerted between a magnetic field and a current carrying conductor placed in that field
What rule is used to determine the force experienced due to the motor effect
Filming left hand rule
When using the flemings left hand rule what does the forefinger represent
The direction of the magnetic field
When using flemings left hand rule what does the second finger represent
The direction of current flow in the conductor
What factors affect the size of the force on a current carrying wire in a magnet field
the magnitude of the current flowing through the conductor
The strength of the magnetic field that the conductor is placed in
If the direction of current in a current carrying wire placed in a uniform magnetic field is reversed what happens to the force
The direction of the force is reversed
If the strength of the current in a current carrying wire placed in a uniform magnetic field is increased what happens to the force
The strength of the force is increased
What criteria must be met for the equation linking force magnetic flux density current and length hold
The conductor must be at right angle to the magnetic field it is placed in
What is the unit used for magnetic flux density
Tesla
T
How does an electric motor work
A coil of wire carrying a current is placed in a magnetic field
The forces on the two sides perpendicular to the field experience forces in opposites
This causes a rotational effect
