15. Electromagnetic Induction

Question 1

What is the formula of magnetic flux 𝟇 ?

Answer 1

𝟇 = B⟂A = (Bcos𝛉)A
where B⟂ = component of B perpendicular to the surface T
A = area of the surface ( m²)
𝛉 = area between B-field and the normal to the area

Question 2

What is magnetic flux?

Answer 2

Magnetic flux is the product of an area and the component of the magnetic flux density perpendicular to the area.

Question 3

What is the formula for flux linkage through the coil N𝟇?

Answer 3

N𝟇 = NB⟂A = N (Bcos𝛉) A

Question 4

What is magnetic flux linkage?

Answer 4

Magnetic flux linkage in a coil is the product of the area of the coil and the component of the magnetic flux density perpendicular to that area, and the number of turns in the coil.

Question 5

What is Faraday’s Law of electromagnetic induction?

Answer 5

Faraday’s Law of electromagnetic induction states that the e.m.f induced in a conductor is proportional to the rate of change of magnetic flux linkage

Question 6

What is the relationship of number of coils and induced e.m.f?

Answer 6

E = -N d𝟇/dt

Question 7

What is Lenz’s Law?

Answer 7

Lenz’s Law states that the direction of the induced e.m.f is such that it tends to produce effects to oppose the change causing it.

Question 8

What is Fleming’s right hand rule?

Answer 8

thumb: motion
index: magnetic field
middle: induced current