The name is absent



Electromagnetic induction


Analogously to defining the flux ΦD of the vector of the electric induction D we
can define the flux
ΦB of the vector of the magnetic induction B :


(33)


φ b = ∫∫ Bds

(s)


It is useful to know that the change in the magnetic flux generates inducted
voltage
VΦ according to the Lenz’s law:


(34)


(35)


V =- dΦB

φ dt

— — ^-π     d Φ B

φ E dl = -B
[           dt


Thus the Lenz’s law shows that there will be induced current if there is a static


cable inside changing magnetic field:


(36)


——

VΦ=-∫∫>d

t

(s) t


or if the cable is moving inside a static magnetic field:


(37)


— —

Vφ = -F × B] l


The full magnetic flux ΦL of the self-inducted magnetic field B by contour with
current
i is called self-inducted flux. The self-inducted flux is linear function of

the current:

(38)

26



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