electromagnetism Flashcards
electromagnetic induction
the inducing of an emf by changing the magnetic flux in a closed loop
Faradays law
The size of the induced emf is proportional to the rate of change of magnetic flux linking the circuit
Lenz’s law
the direction of the induced emf opposes the charge causing it
magnetic field
A region of space in which magnetic forces can be felt
Transformer
a device which changes the value of the alternating voltage
Magnetic flux density(B)
The number of magnetic field lines per unit area
Equation for Moving charge in a Magnetic field
F=Bqv
B=magnetic flux density
q=charge
v=velocity
Size of force of a current-carrying conductor in a magnetic field
F=BIL
B= magnetic flux density
I=current
L=length of conductor
State two quantities that affect the magnitude of the force on a current-carrying conductor
in a magnetic field.
magnetic flux density, current, length of conductor, angle
Why does a magnet that is free to rotate point towards the North?
Aligns with the Earths own magnetic field
When would a current-carrying conductor in a magnetic field not experience a force?
When it is parallel to the field
Give two advantages of a circular accelerator over a linear accelerator.
Takes up less space
particles can achieve greater energy / speed
