Chapter 28 Inductance and Electromagnetic Oscillations 2. Self-Induction EMe The emf appears in self-induction is called self- induced emf It obeys Faraday's law ofinduction d d(NΦ) dt dt Y=LI dⅠ fl is constant E;=-L dt The minus sign indicates that the self-induced emf has the orientation such that it opposes the change in 1.Chapter 28 Inductance and Electromagnetic Oscillations The emf appears in self-induction is called self￾induced emf. It obeys Faraday’s law of induction. The minus sign indicates that the self-induced emf has the orientation such that it opposes the change in I. 2. Self-Induction EMF t i N d d  = − where  = LI If L is constant t I i L d d  = − t N d d( ) = − dt d = −