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39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 10 Q, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A

39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 10 Q, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 102, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A 40. A solenoid of length 15.0 cm with 2500 turns is placed coaxially in side the solenoid. The solenoid is a coil of cross sectional area 4.2 cm? which has 50 turns. What is the mutual inductance of the arrangement? A. 9.9 mH C. 0.89 mH B. 5.0 mH D. 0.44 mH
Transcribed Image Text:39. A 110 V direct current motor generates a back-emf of 98 V when it runs at full speed. If the resistance of the coil of the motor is 102, the current which flows through it is A. 1.2 A C. 11.0 A B. 9.8 A D. 20.8 A 40. A solenoid of length 15.0 cm with 2500 turns is placed coaxially in side the solenoid. The solenoid is a coil of cross sectional area 4.2 cm? which has 50 turns. What is the mutual inductance of the arrangement? A. 9.9 mH C. 0.89 mH B. 5.0 mH D. 0.44 mH
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