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Unformatted text preview: lim (kl9356) Homework 17 Weathers (22202) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points Assume that the length of the solenoid is much larger than the solenoids radius and that the core of the solenoid is air. Calculate the inductance of a uniformly wound solenoid having 230 turns if the length of the solenoid is 37 cm and its cross-sectional area is 4 cm 2 . Answer in units of mH. 002 (part 2 of 2) 10.0 points Calculate the self-induced emf in the solenoid described in the first part if the current through it is decreasing at the rate of 49 A / s. Answer in units of mV. 003 10.0 points An automobile starter motor draws a current of 1 . 7 A from a 17 . 2 V battery when operating at normal speed. A broken pulley locks the ar- mature in position, and the current increases to 12 . 3 A. What was the back emf of the motor when operating normally? Answer in units of V....
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