Magnetic Fields Flashcards
In what direction do magnetic field lines go
North to south
Where is the south pole of the earth
Underneath the geographic north pole
Describe the right hand thumb rule for a straight wire
The thumb points in the direction of the current and the rest of the fingers curl into a fist, the curling being the direction of the magnetic field.
What is the equation to determine the field strength of a magnetic field
F = BIL sin θ, if the object is not at right angles to the field
What happens to a charged particle when it moves through a small force
The moving charge creates a weak magnetic field around itself which interacts with the field it is in
What is an equation for magnetic field strength related to charge of particles
F = Bqv sin θ
What happens to a long straight wire, with a current running through it, when placed in a magnetic field.
A force is experience by the wire, It’s direction is determined by Fleming’s left hand rule
Describe Fleming’s left hand rule
The thumb points in the direction of the force, the first finger points in the direction of the magnetic field, and the second finger points in the direction of the current in the wire.
Magnetic Field Strength
Force per unit current length at ninety degrees to the field
Tesla
When a wire of 1m is carrying a current of 1A at a right angle to the field it experiences a force of 1N.
What happens when a charged particle enters into a magnetic field
A force is exerted upon the particle at 90 degrees to the direction of motion, This moves the particle in a circular direction around the magnetic field, However the speed of the particle does not change
Explain hall voltage, in a conductor carrying a current inside a magnetic field.
As the electrons move through the conductor the difference between charge of both sides means that a there is a voltage across the conductor.
Where does the difference in charge that causes hall voltage come from
The magnetic field causes a force to be exerted upon the moving charges, This force moves the charges to one side of the conductor causing a difference in charge.
What is one equation for electrical field strength, and how does this relate to hall voltage
E = V/d, V = V_H, d = x
Where V_H is hall voltage
and x is the separation in the conductor
