lecture27 - Make-up Labs: Tuesday, Thursday, Friday, March...

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Make-up Labs: Tuesday, Thursday, Friday, March 20—23 in BSB-B116, during the regular lab times. See Jake Vanderwal (BSB-B117) to sign up. It is your responsibility to arrange a make-up lab if you missed one of the labs for any reason. If you did the lab, but your mark is not posted on WebCT, e-mail your lab TA right away. Inductance (II) Inductance (II) Text sections 32.1 - 32.3 Practice: Chapter 32, problems 16, 17, 25, 27, 35, 65 c) • Inductors in circuits •RL±c ircu its
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Self -Inductance Inductance dt dI L L = ε I 2 2 1 LI U L = o 2 2 Volume µ B U u B = Potential energy stored in an inductor: Energy density in a magnetic field: Quiz 12 V 20mH What is the current 2 milliseconds after the switch is closed? A) infinite B) zero C) undefined D) other (specify)
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12 V 20mH Close switch at t = 0 plot I vs t є B L 0ms 1ms 2ms 3ms Example: Example: 200 mH I = 10A Initial: i =10A, U i =½ (0.2 H)(10 A) 2 = 10J Final: f =0, f =0J (switch open) Where does the energy go?
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Example: Example: 12 V 200 mH 50k 6 I 3 2 1 a) The switch has been closed for a long time. Find the
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lecture27 - Make-up Labs: Tuesday, Thursday, Friday, March...

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