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Message: <blockquote data-quote="AnuradhaRa" data-source="post: 18486172" data-attributes="member: 325076">For a RL circuit, I know as a fact at t=0, there is a back emf that is almost equivalent to the original emf source. In order for the back emf to exist, there needs to be a magnetic field in the inductor. In order for there to be a magnetic field in the inductor, there needs to be a current flowing through the inductor. In fact, the current would need to be close to the maximum current to induce such a large back emf noticeable at t=0. Yet, at t=0, I also know that the current in an RL circuit is 0. And so on. Is this a paradox? What did I miss here?what accounts for the physical existence of a back emf? Without a current in the inductor, I don't see how there can be back emf.</blockquote>

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