Lecture 30c

# Lecture 30c - Inductors and Inductance Inductor =(coil of...

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Inductors and Inductance Inductor = (coil of wire)

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Magnetic field of a straight wire with current Coiling the wire: magnetic field lines go through the coil Changing the current in a coil can “induce” an emf in a second coil. A related effect happens with a single coil: an attempt to change the current through the coil leads to a self-induced emf. Self-induced emf acts in a direction to oppose the change of current.
3 in B inside 0 | | A in nl BA N A d B N B ) ( 0 Calculating the self-induction effect for a solenoid ° = ± ² turns/length L depends on geometry Units: [Henry] Solenoid of length l with N loops. Each loop has area A dt di Al n dt d B 2 0 Faraday’s Law Flux thru’ N loops is N times the flux thru’ one loop: dt di L lA n L 2 0 Self-induced emf (back-emf)

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4 Two identical solenoids, each of inductance L, are connected together to form a single very long solenoid of inductance L total . What is L total ? + = L L total = ? L A) 2L B) 4L C) 8L D) none of these lA n L 2 0 Turns per unit length length c/s area inductance
5 I make inductor A by coiling a wire in a single layer around a long plastic cylinder. I make inductor B in the same way, except I coil

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Lecture 30c - Inductors and Inductance Inductor =(coil of...

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