Lecture_11

Lecture_11 - Lecture 11-1 Lecture Self-Inductance As...

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Lecture 11 Lecture 11 -1 Self-Inductance As current i through coil increases, magnetic flux through itself increases. This in turn induces back emf in the coil itself When current i is decreasing, emf is induced again in the coil itself in such a way as to slow the decrease. Self-induction L i Φ = 1 N L i Φ = (if flux Φ 1 through 1 loop is linked by N loops) self-inductance Faraday’s Law i L t ε Δ =− Δ unit: henry 2 Tm Vs H A A ==
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Lecture 11 Lecture 11 -2 Behavior of Inductors Increasing Current Initially, the inductor behaves like a battery connected in reverse . After a long time, the inductor behaves like a conducting wire. Decreasing Current Initially, the inductor behaves like a reinforcement battery . After a long time, the inductor behaves like a conducting wire.
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Lecture 11 Lecture 11 -3 Physics 219 – Question 1 – February 21, 2011 The switch in this circuit has been open for a long time. Then the switch is closed at t = 0. What is the magnitude of the current through the resistor immediately after the switch is closed? a) zero b) V/L c) R / L d) V / R e) 2V/R
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Lecture 11 Lecture 11 -4 Example a) V /(R 1 +R 2 ) b) V/R 1 c) V/R 2 d) V/L e) zero The switch was closed and remains closed for a long time. What is the current through R 1 ?
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Lecture_11 - Lecture 11-1 Lecture Self-Inductance As...

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