Electromagnetic Induction Flashcards
What is electromagnetic induction?
Electromagnetic induction is the phenomenon of generating an electromotive force by a varying magnetic field.
What does Faraday’s law of induction state?
The extent of the electromotive force induced in a coil is proportional to the rate of change of the magnetic flux.
E = -dΦB/dt
State Lenz’s law.
Lenz’s law states that the direction of current induced in a coil by a varying magnetic field is such that the resulting magnetic field from the coil opposes changes in the original magnetic field.
What is the formula for the magnitude of EMF in a moving conductor?
E = BLV
B = magnetic field intensity
L = length of conductor
V = velocity
What is the formula for current induced in a moving conductor?
I = BLV/R
R: resistor.
What is the formula for a force acting on a moving rod?
F = B²L²V/R
What is the formula for power involved in a moving conductor?
P = B²L²V²/R
What is mutual inductance?
A varying magnetic flux is produced due to varying current. Thus, if two coils A and B with varying current are placed side by side, then the varying magnetic flux in A is able to produce an emf in B, and vice versa. This phenomenon is known as mutual inductance.
What is self inductance?
Self inductance is the ratio of the back emf produced by a varying current in a coil to the rate of change of said current.
Relate the induced electromotive force of a coil with the mutual inductance of the system.
E = M • (∆ip/∆t)
Where ∆ip is the current of the coil inducing the emf
And E is the emf induced.
