电磁感应2

电磁感应2q

° q ° q qq§Pq¤q° kw (Faraday’s Law) k P w(Faraday’s Law of Induction)

E =

dΦ B d = ∫ B dA dt dt
emf)

E: Pq°(induced

ΦB: qq(magnetic flux) “-”: §Nw (Lenz’s Law) The polarity of the induced emf is such that it tens to produce a current that creates a magnetic flux to oppose the change in magnetic flux through the area enclosed by the current loop.

¤¤¤jz¨t ]¤Z

qP¤G -1

q §Nw

±aqy°éb§¤¤¤±§

E =

dΦ B d = ( BA cos θ) dt dt
BH§

″≤∞Π≥≠θ °∏≡κ

-±nH§ ¨¤×θΗ→