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HW23Sol - Platt David Homework 23 Due Nov 2 2005 4:00 am...

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Platt, David – Homework 23 – Due: Nov 2 2005, 4:00 am – Inst: Ken Shih 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A circuit consists of a 32 Ω resistor and a 740 mH inductor connected in series to a 17 V battery. What is the value of the current when the current is increasing at the rate of 4 A / s? Correct answer: 0 . 43875 A. Explanation: Let : R = 32 Ω , L = 740 mH = 0 . 74 H , V = 17 V , and Δ i Δ i = 4 A / s . In an RL circuit V = L Δ i Δ t + i R i = V - L Δ i Δ t R i = 17 V - (740 mH) (4 A / s) 32 Ω i = 0 . 43875 A 002 (part 1 of 1) 10 points In the circuit below a steady current I 0 is flowing when the switch is in position “a”. If the switch is then thrown to position “b”, the current will decrease to zero after some time. L R E S b a I ( t ) Suppose we replace the inductor with one of the same area and length, but twice as many turns.

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HW23Sol - Platt David Homework 23 Due Nov 2 2005 4:00 am...

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