Magnetic Fields Flashcards
What is a magnetic field?
A magnet field is a region in which a magnet pole will experience a non-contact force
I’m which direction do magnetic field line point?
From north to south
What is magnetic flux density?
Magnetic flux density is a measure of the strength of a magnetic field. It can be viewed as the number of magnetic field line that pass through a given area
What three factors determine the force exerted on a charge moving through a magnetic field?
1) the magnetic flux density
2) the charge of the particle
3) the velocity of the particle perpendicular to the field
State the equation used to calculate the force of certes in a charge moving through a magnetic field?
F=BqVsinx
What is the relationship between the direction of a charge’s motion and the direction of the magnetic force jt experiences?
The force is always perpendicular to the charges motion
Describe and explain the path taken by a charge in a magnetic field?
The charge will move in a circular path. This is because the magnetic force always acts perpendicular to the charge’s motion and so acts as a centripetal force
What is produced by a current-carrying wire?
A magnetic field is produced in a concentric circles around a wire when a current passes through it
What occurs when a current-carrying wire is placed in a magnetic field?
The wire will experience a force due the permanent magnetic field interacting with the wire’s magnetic field
What three factors affect the force experiences by a current-carrying wire placed in a magnetic field?
1) the magnetic flux density of the field
2) the current passing through the wire
3) the length of the wire
State the equation used to calculate the force experienced by a current-carrying wire placed in a magnetic field
F=BILsinx
What is Flemings left-hand rule used for?
To determine the direction of the force experienced by a current-carrying wire or living charge in a magnetic field
What does the thumb represent when using Flemings left hand rule?
The thumb represents the direction of the force
What for the first finger represent when using Flemings left-hand rule?
The direction of the field
What does the second finger represent when using Fleming’s left-hand rule for a moving charge?
The direction that a positive charge would move. This means that of it is a negative charge, you just point your second finger on the opposite direction to its motion