Maxwells Equations

Question 1

What is Faradays´s law of Induction?

Answer 1

the induced electromotive force in a stationary closed circuit is equal to the negative rate of increase of the magnetic flux.

emf=-dΦ/dt

Question 2

What is Lenz´s law ?

Answer 2

The induced emf will cause a current to flow in such a way to oppose the change in the linking magnetic flux.

Question 3

What is a Transformer?

Answer 3

Is an AC device which convers high voltage/current to low or vice versa. It has two or more coils coupled magnetically through a common ferromagnetic core.

Question 4

What is an ideal transformer?

Answer 4

Ideal transformers assume the permeability is every large μ→∞.For the ideal transformer, there is no leakage flux so the mutual inductance is.

Question 5

What is a real transformer?

Answer 5

A real transformer we find that the voltage on the primary is dependent self-inductance of primary and mutual inductance. Vice Veras for second.
A real transformer there is leakage flux, so mutual inductance is.And it depends on the coefficient of coupling.

Question 6

What are the four Maxwells Equation?

Answer 6

∇∙D=ρ_free
∇×E=-∂B/∂t
∇∙B=0
∇×H=J_free+∂D/∂t

Question 7

How do we find the electric field intensity from vector potential A?

Answer 7

The electric field intensity is the negative gradient of the electric potential subtracted from the time derivative of the magnetic potential field.
E=-∇V-∂A/∂t